Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea24aabf3c4522ed…

MALICIOUS

PDF

84.3 KB Created: 2021-04-05 22:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 906ef6d1d6f21c03004ad6fb51ebe63d SHA-1: 7ce82af18cafb5058db652871a50ad5160ee2345 SHA-256: ea24aabf3c4522ede5ca6ff864a88ee8f82da64df9a2c86323db1c9d82bb3200
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. One of the primary external links, 'https://dafemum.ru/strik?utm_term=kenmore+model+417+washer+dryer+combo', suggests a potential phishing or scam attempt related to product searches. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=kenmore+model+417+washer+dryer+combo
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6061e524c5a1c.pdf
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fdba98d0e593.pdf
    • http://rawenspant.online/the_bethlehem_star_2020_where_to_lookkmlwp.pdf
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a03d4adf2.pdf
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcbec4eed126.pdf
    • http://coolstudent.space/nunitugubm9ecb.pdf
    • https://cdn-cms.f-static.net/uploads/4480145/normal_602c305873cfe.pdf
    • http://lightly.store/2862128552884133.pdf
    • http://acgmgroup.ru/fegijepumwj7d.pdf
    • https://static.s123-cdn-static.com/uploads/4494160/normal_5ff5176de8a4d.pdf
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5fc674d767937.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_5dfecca4ce1e40bc9413fecaf6b7e41b.pdf?index=true
    • https://633ee4a5-ef7f-4c35-8c02-ac6c60bc6361.filesusr.com/ugd/0ab374_bf5a841c25784920a101f75a92308b4e.pdf?index=true
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_bb91d381ed1f486599acd4e6c37af675.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_e6ccc89aa8444bbcafd564cc81993ed5.pdf?index=true
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_0a59578eba174298944a8fb2fa93e21a.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_6b620c7f5efe4586837889a28ae6784b.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_eb78d90f9efa4b2e8fbd118a213c74f6.pdf?index=true
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_e02b0787ed934326bb717a9c2de887a7.pdf?index=true
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_3a4ae76372e347e2a015e38359fa6e29.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d9d8fa5-ffa7-415f-b4d9-6a2d02cf7ee1/mexazalumutekudati.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_6a38fb402a894caa9c92f73333f85a75.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a2111d32-bc93-440a-b96c-e1a504ca4ee2/happy_endings_season_3_episode_11_cast.pdf
    • https://uploads.strikinglycdn.com/files/845af2c8-7975-459e-9c1a-639cb3f89d02/integral_calculus_engineering_mathematics.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_off00010ab2.bin
2b2fc017aa8bcf7208a726743ce72cbb62bd8c8e3fb9314327bcb058c7ab6d37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 5704 bytes
font_01_sfnt_off00011e14.bin
a5fbab2a40b4bcc7beb05deafb22e4d1be40c020c90c2e1f8ba43484a10aa440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 11176 bytes

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