Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2ed5810dfc7f2a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-11 02:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aaf4dfe63f844ce35718a2f7c6d070ff SHA-1: 74ed6e4c433efaac440c106f7d75a77dabd3d2af SHA-256: cf2ed5810dfc7f2a076a09277cfc7184c6773ca1abe0b2eeb24bfc264c0d9e67
156 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 of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=holy+bible+new+international+version+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6011045a7e520.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/hbgdBge/24784654829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381085/normal_60081d3348166.pdfIn PDF document text
    • http://xevuxoj.22web.org/2614673014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_600da7dc3544a.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/8JhbCuy/rirumokoxejebam.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/3WgdjWs/97165046929.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/fovojupunive.pdfIn PDF document text
    • https://cdn.sqhk.co/sokaxopoje/MgfShbA/jozew.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/ghIhcNj/85012763131.pdfIn PDF document text
    • https://raxokada.weebly.com/uploads/1/3/1/4/131409035/lopol-vezux-fubibijexub-lexafupebaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xefejevife/supewuvas.pdfIn PDF document text
    • http://mijekobafenado.rf.gd/pebufaniladaga.pdfIn PDF document text
    • http://jewulepip.epizy.com/13977062679.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/urdu_taqreer_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/harry_potter_lego_castle_71043_price.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/porakudonofawimeseruxi.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/carpentry_and_joinery.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/zizopisevepanulepefova.pdfIn PDF document text
    • http://tedizixulore.epizy.com/52228022387.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/vofiketotoxogonar.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/bloc_quebecois_platform_macleans.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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 5388 bytes
SHA-256: 72b71d13ba3b55fedca99beb708b94dc5f71165324038161a102cbad2f2a8dcd
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 10148 bytes
SHA-256: 82aef463934255624775bb2e82aa1308b79fcbd0a27e743fe1472326bd9c9e2a

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