Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7221ed5267e872…

MALICIOUS

PDF

76.0 KB Created: 2021-03-06 16:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05dd39b5de9ff4b884621f039fe0e02e SHA-1: e6b4271eb5ceff66aada14607d302e287987152c SHA-256: 9c7221ed5267e872ac03ae4250e5ca50368214c3b70e19cbf0b5c78db2019a83
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=my+cloud+mirror+install PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386347/normal_6003d0d9c8a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_601951f263bc8.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/gjfgij3/xuxar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6013edd31fa0a.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/jagdheY/checkers_online_multiplayer_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/iajgjh9/97125975675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372073/normal_600105dff3875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fe74e787379a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_6042ac978ac84.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/hceW9jh/51673079604.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/wSa2Tjd/xijas.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/aDPt5jg/74557193117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_603e6b4b181cc.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/77140442094.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/banuvopegoxowerudabudaba.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/hg9jigc/todo_incluido_para_cubanos.pdfIn PDF document text
    • https://cdn.sqhk.co/zefadanexa/Gcagigh/23763361193.pdfIn PDF document text
    • https://cdn.sqhk.co/fexivijemozu/oxkhdhg/razuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_601abc3432182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_601f246e5f83d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_a72e5122e103423f9beaff03d06fb03f.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_ab4dcaa8cbf84807bfe2830027ca2184.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_b18f2665351544b08db9b177afcdc01e.pdf?index=trueIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_to_use_white_house_apple_cider_vinegar_detox.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_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 5192 bytes
SHA-256: 1ba7db8236d5dd5ae5228734a1a6f37bb22ac8b59a79092ffa4142704ffe655f
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10592 bytes
SHA-256: 0d944e223a107b5bf177fc5f8995e26e1949090b5821e0574179eebc3f7f6911