Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f189025d57a83fb…

MALICIOUS

PDF

76.2 KB Created: 2021-04-24 16:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d79079f9b5b6313e300319ce7824a4fa SHA-1: d8505ecc12a69bd06f79b729087f7a1ee5dc030d SHA-256: 5f189025d57a83fbb6e66f1fb9c47cc6c2580325dd81cc24032d73ab8a6c54fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://pelibifir.ru/strik, is likely used to distribute a second-stage payload or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=jeu+de+cartes+personnalis%25C3%25A9+photo
    • https://cdn-cms.f-static.net/uploads/4454984/normal_60267cd3b0c79.pdf
    • https://cdn-cms.f-static.net/uploads/4479210/normal_6065aa0a1e20a.pdf
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/8589067.pdf
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fe1d8d143613.pdf
    • https://cdn-cms.f-static.net/uploads/4454668/normal_602df81e608fd.pdf
    • https://cdn-cms.f-static.net/uploads/4450502/normal_600f3fafebfcd.pdf
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/5177798.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_6016c45781a68.pdf
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff292af99174.pdf
    • https://cdn-cms.f-static.net/uploads/4380867/normal_60649d770b1e3.pdf
    • https://cdn-cms.f-static.net/uploads/4468554/normal_602bb062235c6.pdf
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60117bde1abc7.pdf
    • https://cdn-cms.f-static.net/uploads/4492580/normal_6035b42e750e2.pdf
    • https://cdn-cms.f-static.net/uploads/4446496/normal_603de7a097f9f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46161211-1783-42b9-b61b-2cf483e4b5d7/hoover_windtunnel_pro_vacuum_manual.pdf
    • https://uploads.strikinglycdn.com/files/29eb1f5c-e1df-403e-9533-5c2239fcafa5/vetutotema.pdf
    • https://58b86397-5572-43bf-ad9e-55c85049b59a.filesusr.com/ugd/10b03a_6b99502fcdd3484b96d790a94eee34cb.pdf?index=true
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_e16a19205d3f4da98e67bbbdbfc210c9.pdf?index=true
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_02ff869189c542f2a9b2f8986cbc7294.pdf?index=true
    • https://uploads.strikinglycdn.com/files/005cda29-ca78-4023-84dd-79330f9f888d/why_med_surg_nursing_interview_questions.pdf
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_70449996109c4675a077001558e381be.pdf?index=true
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8adcca9b44d1415ab0741010a4a11ffd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96a.bin
b0b56c5be646c515ae701ae96f01c2b6c2c4d48f037db6efa8f4544d49ed901e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5292 bytes
font_01_sfnt_off0000fb13.bin
db0f45dc33e855d9dacfd2486d43130986753f068dad996803b71a85c639254e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 12436 bytes

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