Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4351502d379289…

MALICIOUS

PDF

96.7 KB Created: 2021-03-18 20:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ebc02e51ffceea097d118c41a0fb5af1 SHA-1: 3723f2dca121badc568e01a674b834958120bfa6 SHA-256: 1d4351502d3792895979828e324abc054dd32d7b3678194a6e4f0a001124343f
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm containing numerous external URLs. The ML classifier also strongly indicated maliciousness. The document's content, though heavily obfuscated, appears to be a lure to encourage users to click on these external links, which likely lead to further malicious content or phishing sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/award?keyword=srimad+bhagavatam+moolam+pdf PDF link annotation
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/59a99ca0601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_605286b240f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/mgfO7he/smart_goals_for_soccer_players.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/50930404f2.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/6aeee0ce9278.pdfIn PDF document text
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/xexugo.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gjbgmF4/50944020326.pdfIn PDF document text
    • http://dulugidi.iblogger.org/greek_mythology_quiz_questions_and_answers.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/3e88572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_6047c5a99181f.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/jijhgc9/xigewijukinokizetim.pdfIn PDF document text
    • https://kuzirorox.weebly.com/uploads/1/3/0/7/130775715/jixaliluxovatozoga.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/haaidNa/gewixerapukonevatusifoti.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/kinizudo.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/jdibiiD/paper_fold_heart_with_wings.pdfIn PDF document text
    • https://mululugasafes.weebly.com/uploads/1/3/1/6/131636627/6183c80ca0.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/iKCAgiP/jaditogozagedanonudiwa.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/6306826.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabewoz/1tZgibc/pes_club_manager_mod_apk_2._3._21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://rafazusasune.rf.gd/43514863851.pdfIn 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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 5580 bytes
SHA-256: 880500ce27fadeeabf289b4efc16afecf8931ea2612b2126e19d532a99ccc079
font_01_sfnt_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 6048 bytes
SHA-256: c9563bf5fb09eacc7591bfd96a62354e7147923a26485cae64afeb2caea56b80
font_02_sfnt_off000134d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D5 12464 bytes
SHA-256: 1689383b03b2a5ba5e7b3f8ef813c9a90abbb47dcfa61842db0160520a62c2df
font_03_sfnt_off00015d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D89 16264 bytes
SHA-256: b7f82d2f7553557e0e94bae4fbbfa034f866ab56970e2f6ca5ebdbc13b4b5e5e

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