Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0563e879b04cea…

MALICIOUS

PDF

81.3 KB Created: 2021-03-25 06:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6f40b8ccc323e269e80e1e8cc11c10 SHA-1: a74cd0705aaf81cb0819d6267361c5652c1b9c2d SHA-256: 5c0563e879b04ceabb4b1947ff17baba24250e53d7e265b75d0a8a7ce06527f2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content or exploit vulnerabilities through linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=apa+references+page+sample
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/435a5ae.pdf
    • https://cdn-cms.f-static.net/uploads/4491925/normal_6023d431320db.pdf
    • http://imedo.ru/67405590873lnx80.pdf
    • http://getcreditreport.info/new_craftsman_chainsaw_leaking_bar_oilpau7u.pdf
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/segagezurut.pdf
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/fuguri.pdf
    • https://cdn.sqhk.co/luwagoma/sEghscu/86567026327.pdf
    • https://cdn-cms.f-static.net/uploads/4379856/normal_603e76ecbfa57.pdf
    • https://cdn.sqhk.co/bidogefapo/ZK7ghaK/84111567353.pdf
    • https://vajudufebebugi.weebly.com/uploads/1/3/4/6/134696622/7728285.pdf
    • https://cdn-cms.f-static.net/uploads/4408001/normal_602c8554b6ea1.pdf
    • https://cdn-cms.f-static.net/uploads/4481164/normal_60597d4923673.pdf
    • https://cdn-cms.f-static.net/uploads/4454665/normal_6051cb7c3dab0.pdf
    • https://cdn.sqhk.co/wenejusuzixe/kejahfv/party_horn_sound_effect_dj.pdf
    • https://fasitidepev.weebly.com/uploads/1/3/4/3/134312072/delijabosuluwalidoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugowubuf/starting_a_online_business_for_dummies.pdf
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_83133f5af272468e9b2a3d39355bd279.pdf?index=true
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_0e0143a2c4d24b638f340e415718e4d8.pdf?index=true
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_ca0c198b82b046769eaade05b018f295.pdf?index=true
    • https://s3.amazonaws.com/lomuper/22982151023.pdf
    • 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_off0001010b.bin
ffa3a9bc28305ed9e3ba7d9b4fb57d60d22174a803ec2e73d3e7d2c1a07616cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 5324 bytes
font_01_sfnt_off00011315.bin
9a6396680e4feefc15a740f68a29b3639a5ee0f23e1d6360350d462004011e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10900 bytes

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