Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d3ee7170d92eb8…

MALICIOUS

PDF

80.2 KB Created: 2021-05-01 14:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b11853ea490cad0e3dfd721d671e6536 SHA-1: 240c683688cd11e809a607cad54ab03b5cfbf479 SHA-256: 11d3ee7170d92eb89491f686f8ebc3e4c0602d1d65a45ea44c4d6a44ec2a6d03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of external URIs and the link farm heuristic strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=someone+like+you+adele+piano+cover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495525/normal_60282eec86eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_603d2fc5eba39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_60158514bbe4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fd2bfab202dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5fc574f3bd418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377116/normal_5fce87f9cb0a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_601ac494041ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_6064dbf3cc31b.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/14441059593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fcafe7d08e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_602af3a8c87ff.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/60884397024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_600c7842a5d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_603b0fd27f23b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_600683b0e5252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_60409f2323ee9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixagikaw.epizy.com/92931725461.pdfIn PDF document text
    • http://gemixeferakin.rf.gd/pomodoro_technique.pdfIn PDF document text
    • http://jaxejibowanub.rf.gd/bovufiduminetopuvuwi.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/ethical_considerations_in_research_methodology.pdfIn PDF document text
    • http://dinonikof.epizy.com/kaxavutugawujulolakuxo.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/sub_divisional_meaning_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5372 bytes
SHA-256: 79e8b25392e427f607d748bda9c8c274fe2cc3dd4e7339b52157040a335796e9
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 11480 bytes
SHA-256: 8a1051300ce399c9aa002212815c1b5db8e67fecacb2621b08cbd4dbc4ea8588

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