Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9702bd750cce6d…

MALICIOUS

PDF

64.1 KB Created: 2021-03-08 16:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5f9fcd40487fc9b703607db4a921f310 SHA-1: 7e29d362bc6130847915825a3bc5f70e6eab0573 SHA-256: 5b9702bd750cce6d343e90001c06b29c8ee0ee5750e14ed1597416f515fab998
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a link farm hosted on disposable domains, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/award?keyword=believe+in+yourself+pdf PDF link annotation
    • http://pressit.space/quadratic_equation_solving_using_quadratic_formula19n9n.pdfIn PDF document text
    • http://olivamebel.com/canon_650d_specificationsthc4m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_60032effdd615.pdfIn PDF document text
    • http://pasetbs.xyz/bnp_cardiacow5ko0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6018d7ba93fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_601af1d6432d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_60251d74b3ee5.pdfIn PDF document text
    • http://koteyarn.moscow/jumuxidokobopezunezowabafa3wwb.pdfIn PDF document text
    • https://nabiwadi.weebly.com/uploads/1/3/5/2/135298838/zozelufeselos_boxumepixidosu_movavusaxuv_jarak.pdfIn PDF document text
    • http://technodom11.com/581087975026krmg.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/nazuduta_vuwevegekosak_tomerekakadi_wexenalazuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379732/normal_5fdfa570b936d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_4434e2a470724c0ca5b72d7781061694.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_a14f868877e847ddb85df9c01131b7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a21b83-7acf-4d97-ab60-0d5a12651814/mockingjay_book_movie_differences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55a472c-de6c-4fd2-915a-b84872402757/guteji.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_off0000bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 5036 bytes
SHA-256: 20b2569e4bcfddbe0dcd0de708331101fef7a52d9d02ff54d97a81e726df1e45
font_01_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10208 bytes
SHA-256: daf849e190d77865d027b41787f8a3463aa3f93ac8805413b76d8dd1f1f81a9f

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