Malicious PDF — malware analysis report

Static analysis result for SHA-256 d109d9560f2da0b5…

MALICIOUS

PDF

83.1 KB Created: 2021-06-01 02:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b0549933df53b747fc664040875ef3a SHA-1: ff32bd52d05d7346636f96cf03bb4ef03262f8a6 SHA-256: d109d9560f2da0b5702e9b6fa372451a928b4912429735ebd7a9adca85de2ea7
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' lure and a high ML classifier score, combined with ClamAV detection as Pdf.Phishing.Trojan, indicates a malicious intent to deceive users. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://synerhu.ru/pbw?utm_term=8+ball+pool+unlimited+guideline+tool+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600d51d268f29.pdfIn PDF document text
    • https://duxubekuzew.weebly.com/uploads/1/3/4/5/134506612/f86b34.pdfIn PDF document text
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/68545758feb5160.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/muroxolop.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/4261449.pdfIn PDF document text
    • https://doxipawuno.weebly.com/uploads/1/3/2/6/132682924/807633.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/5963806326756.pdfIn PDF document text
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/mexuz.pdfIn PDF document text
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/zabofodejupabit.pdfIn PDF document text
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/6f8087e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481993/normal_60b2bee44e745.pdfIn PDF document text
    • https://motadali.weebly.com/uploads/1/3/4/3/134368257/reguwotef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fface5ca85d9.pdfIn PDF document text
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/051069729c270cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468551/normal_5fe80201564f0.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/3041437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369499/normal_6000ecddac174.pdfIn PDF document text
    • https://kenagikapafixop.weebly.com/uploads/1/3/5/3/135301514/dazozinizafomugowiju.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/9546769.pdfIn PDF document text
    • https://nukusiluvo.weebly.com/uploads/1/3/4/6/134612364/6534442.pdfIn PDF document text
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/simerozutin_vawopur_netuwuzuw_tugibive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144428175/satesijijubugilato.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/tufuwoposela.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/bible_contradictions_answers_in_genesis.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144417120/led_tv_service_manual_free_download.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144427578/wigemuj.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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 5308 bytes
SHA-256: e77e5e56612e5468c024e84f29025ebc8787d66230c3563a21c15620e415ade7
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10840 bytes
SHA-256: cbe533644f273856ab2d898e76eaafd862e63ae54359bac8ffcba61bd4dd5d2a
font_03_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 16164 bytes
SHA-256: f2981b076b2acc4485e95bab8d96cdc39c301520e4df910bc1be85d4b54df77e

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