Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9affef92bd9c04…

MALICIOUS

PDF

79.9 KB Created: 2021-06-06 20:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 02f528a1461ac51e3567d0db060aa634 SHA-1: 434431c3f47e9dd71548690d7c45fdb5df582a5d SHA-256: 8e9affef92bd9c049ba549721efb1f4f93f95c0f2a87ed175eeb38a3e340eff2
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with a high concentration on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a larger distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://huntic.ru/pbw?utm_term=edexcel+international+gcse+%25289-1%2529+mathematics+b+student+book+1+answers PDF link annotation
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/9c538137b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_6061775ec6b5e.pdfIn PDF document text
    • https://wuzipagaxu.weebly.com/uploads/1/3/0/7/130776492/5538362.pdfIn PDF document text
    • https://kefenageteda.weebly.com/uploads/1/3/0/7/130775977/rekokorubovudox.pdfIn PDF document text
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/turibibapirev-gilazezawasi-pupovur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_606abcf64025c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6055f31c99635.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/lasiful-roganuzubux.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/4b4ad94d83a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_60260e1830415.pdfIn PDF document text
    • https://wuziwewaramided.weebly.com/uploads/1/3/4/3/134311070/sumejoxibu_nebav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601fe80e6727d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_60b8341a36846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujusevo.pbworks.com/f/20466128227.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144574377/duzuvenodofeme.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418398/twrp_3.0_2_apk_download.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/japegidakejadik.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/un_decametro_cuadrado_cuantos_milimetros_cuadrados_tiene.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144611010/43539654205.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 6068 bytes
SHA-256: 6880f70edc125103641c2be0e24dc46e0c25c3e7e98fdd16c0da50794d4b9d2d
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 11632 bytes
SHA-256: fe474c603ada1e9e4463818f77a7c20f2b1d8c67f55b60db2a17e8fd2485b5a4

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