Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2271e3d7daed93…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 10:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8e3ed9c3206ded3bce3e9d41fb9157e0 SHA-1: fee2387450bece321626c4d6615c889a35ad5c18 SHA-256: 7a2271e3d7daed93c1fa6497ca464f84c987aa5abc6aeb892841128399efe440
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is part of a link farm designed to host numerous other PDFs, likely for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the nature of the link farm point towards a phishing or malware distribution scheme, potentially using the 'marriage certificate form' as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=marriage+certificate+nsw+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fc8b408bb7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6042fa8c83b7e.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/P7zdbjf/76904176644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_6049216848e33.pdfIn PDF document text
    • http://uose.xyz/zagg_folio_for_ipad_8th_generation94v51.pdfIn PDF document text
    • http://workshop-fb.ru/rokeduvexopakupipugds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fc66c88c8b71.pdfIn PDF document text
    • http://antonioita.fun/nebomokujepeml76w1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5fe62911c7f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/MggcOIM/pinata_store_austin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5ffe1a44e4323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fe75825c1ac1.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/75f7ae42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fe3813c1e805.pdfIn PDF document text
    • http://romeital.space/10226753983xz93m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_602d394080973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412568/normal_5ff81311474ff.pdfIn PDF document text
    • http://znohist.site/brihaspati_dev_ki_aarti9ka9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6033c9501328a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fe41f29d0e6d.pdfIn PDF document text
    • https://wotutokope.weebly.com/uploads/1/3/5/3/135315373/eba512c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 5268 bytes
SHA-256: 5450987322b38df0ff60fdc08ef9105a5dc4583e55cbc220c38b766bd6243174
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 10592 bytes
SHA-256: 7bdde55d2a3a71419c77e464fa35d1350d9168584da69add8eef9a69aeaf9545

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