Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4d2bd994ba5207…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 04:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6f827daba1e80628274fe1f99b41d8c8 SHA-1: b8a151d0974882817d42c1567abaeefd23986205 SHA-256: da4d2bd994ba5207e75184275fef25cdae622854e284b82ff0ed3fe3c7a40bb8
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=gta+san+andreas+cheat+codes+ps2+free+download+pdf PDF link annotation
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/2348679e84fdf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393647/normal_5ff76e58cd72b.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/vicLH73/never_have_i_ever_questions_for_friends_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/dLjawnd/bosof.pdfIn PDF document text
    • https://ditaziretuviki.weebly.com/uploads/1/3/0/8/130874055/1937563.pdfIn PDF document text
    • https://sorurilinoko.weebly.com/uploads/1/3/5/3/135397097/rudojefamabureg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_601aa8e50f361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_600fea851640a.pdfIn PDF document text
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/8690342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fecc02406677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_605a28897c1f2.pdfIn PDF document text
    • https://wadasowodasi.weebly.com/uploads/1/3/5/3/135316150/6047112.pdfIn PDF document text
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/faratoj_rejudiresuveb.pdfIn PDF document text
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/1c9e1ae.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/TqidqmT/ragawalame.pdfIn PDF document text
    • https://gigexozokup.weebly.com/uploads/1/3/2/6/132695408/3020033.pdfIn PDF document text
    • https://riganekonima.weebly.com/uploads/1/3/0/8/130874133/kogejakumi_luwukosana_matan_xoxalojugowi.pdfIn PDF document text
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/f8ed90711bf3.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/5f998fe.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/pulavokaxe/car_bill_of_sale_template_word_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/nodovevodelom.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/93921972027.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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5496 bytes
SHA-256: 7d8d13c02381f8d54d72ba23eb3bc11ca8c10823dee40244cf43717c47d35e98
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 10476 bytes
SHA-256: 68a0766754f94f1bebebc38c0c24b4cb2b036b05d775ef9a80badb4dc5f0260e