Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4d95e184b8697b…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 23:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2728b53693015190d30ac7967e4498c3 SHA-1: eb66bd711dabd6fb6e2542f62cfdd88eb06d4d10 SHA-256: 1b4d95e184b8697b1c20b5fe7dd008094bcd1a3fc4a572a985feccf378926803
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'golowaki.ru', suggesting a phishing or malware distribution lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a malicious campaign designed to redirect users to potentially harmful sites.

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 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://golowaki.ru/award?keyword=africa+political+outline+map+pdf PDF link annotation
    • http://tetizeniwa.mypressonline.com/gusojumif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_604508d2db486.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/6Ijiggf/56923913366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_604b90ce63f10.pdfIn PDF document text
    • http://soul-felt.com/73532451817o4iq9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fced92c64f76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418973/normal_5fc9f64d06d72.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/cXP7g5J/jipezuzovitarono.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/Utibrhg/6850146199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_60104a9cceb0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_600df021bf5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_604d412c9bc8e.pdfIn PDF document text
    • http://2020coupons.info/724465496858m87f.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/bdYROEB/terra_cotta_hex_tile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5feaf92989d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_6009e4849421e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5ff7f844495d7.pdfIn PDF document text
    • http://neojust.ru/federal_buyers_guide_forma9hyt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6052dc3297fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_5fe64e0b52fa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/bokoxaza.pdfIn PDF document text
    • http://segimoto.myartsonline.com/langman_s_medical_embryology_11th_edition.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5112 bytes
SHA-256: 7ec568be45d02a6e33f9c4611c62e29955c74e9c781ff69086847e69b23d5db3
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 10680 bytes
SHA-256: c2414e384fe8d5aef85d6e1630045dcc7325f4662a5142f5282cc21eb2c3ad88

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