Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5344c42e61d9f5…

MALICIOUS

PDF

101.6 KB Created: 2021-03-12 00:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 63f8a25c4ac8a7be92c967a7f6686b20 SHA-1: bb6aaa755f1c05445fe00800306fce0d385e15a6 SHA-256: ff5344c42e61d9f55c5b1e7ce3022682608c3788f71355eb060c8d6d3d0fa3cc
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a link farm, containing numerous external links to other PDFs hosted on disposable or less reputable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a malicious intent, likely to distribute further malware or engage in SEO abuse. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/123?utm_term=cymera+for+android+2.+3 PDF link annotation
    • https://bikarulag.weebly.com/uploads/1/3/5/3/135313840/wefasiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_603c3423ebc19.pdfIn PDF document text
    • https://misevitazivizux.weebly.com/uploads/1/3/4/3/134376704/genolejozepobopuzedu.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/e2jgEgd/892245341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448991/normal_5fc99e4a035b6.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/tameb_kezivelipalu_tuvakubov_jipojadejasuk.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/L4ihbCN/monkey_go_happy_unblocked_hooda_math.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/papojat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021f99b07a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ffc48fd02104.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/514f4.pdfIn PDF document text
    • https://zomusabizexeko.weebly.com/uploads/1/3/4/3/134317177/21a7f14cb6dc9e.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/4424571.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/hAiijfM/rovudozedejopabetiw.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/xokefavez_mapapexesewesi.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/9fa21ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_5fc86653b6a74.pdfIn PDF document text
    • https://cdn.sqhk.co/bivaxijo/ihidSCG/vilafiwurexukinuwobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_604008d42fe0e.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/5b0a0e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_602c930dee886.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/4f674006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ffd9dc6a1a41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5feef1822cad4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxunafifu/3Vjihgr/bird_feeder_diy_bottle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 6676 bytes
SHA-256: 8c7d19c5f97f84c488b30f3d1e2415ab561a2bff7dbc97f4405e82db792a7af7
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 5004 bytes
SHA-256: 8d75eed3c3e71ac3cb484ae9c9d8d8ab5178a2ecfbc70f7a7d89002ab7de8b51
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10140 bytes
SHA-256: 0808a1a4e1a5f0ffee6e4213edba49c8126cf8921dcb6881b9b22f2362967e2b
font_03_sfnt_off00013b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B41 11532 bytes
SHA-256: f2c4db0e3754cfffae05e26e2a1cc241298d5a6839b432dcd738851fd333f06a
font_04_sfnt_off00016313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16313 16436 bytes
SHA-256: 78f84b5512170ca8e0c9353f43dac8f84985894b2cef99d86d4a1c2adbbaf3fa
font_05_sfnt_off00017955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17955 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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