Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d756270bfd28c…

MALICIOUS

PDF

90.5 KB Created: 2021-06-01 05:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaeab0bbbd62184a665cc01f68f5491c SHA-1: 7729b00a82c85ba9d9fc0689d76d3103e48c3629 SHA-256: 225d756270bfd28c9e2d0d858936412bdcf934848014b213bfcdc8542db06cd8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link farm services, suggesting a SEO poisoning or link farm attack. The document body, though heavily corrupted, contains text related to solving a Rubik's cube, likely a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/pbw?utm_term=how+to+solve+rubik%2527s+cube+advanced+method+in+tamil
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/3bbe14.pdf
    • https://limazosit.weebly.com/uploads/1/3/1/3/131380555/dogabotumegaxigo.pdf
    • https://cdn-cms.f-static.net/uploads/4377410/normal_605ba154329bf.pdf
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/2850398.pdf
    • https://cdn-cms.f-static.net/uploads/4369797/normal_601814a6b7e6a.pdf
    • https://somuwozav.weebly.com/uploads/1/3/4/5/134525430/4e4cb0406ceee58.pdf
    • https://cdn-cms.f-static.net/uploads/4371812/normal_6020ff18e8743.pdf
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/jawoboge-sunasan-baxokebafolu.pdf
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/8eb310.pdf
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fe6c470bf53e.pdf
    • https://cdn-cms.f-static.net/uploads/4454420/normal_605d118e10a3e.pdf
    • https://xupodidif.weebly.com/uploads/1/3/0/7/130739682/kafamir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/917a24b5-7200-426f-884d-f8e03856611b/nasujiga.pdf
    • http://sejuworepow.pbworks.com/w/file/fetch/144417162/pharm_hesi_study_guide.pdf
    • http://gazumadu.pbworks.com/f/72937856302.pdf
    • https://uploads.strikinglycdn.com/files/d291ce63-3d56-4646-8198-7d1b74952554/toro_blower_vacuum_replacement_bag.pdf
    • https://uploads.strikinglycdn.com/files/a539d15a-d288-4ff3-8201-e06119f69ed6/pazalu.pdf
    • http://poxanoralanu.pbworks.com/f/62992060879.pdf
    • http://wuwazilizos.pbworks.com/f/automatic_transmission_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/b16baa6e-bf88-4db7-b310-21aaf7aadbde/how_much_do_foster_parents_get_paid_in_nm.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115f0.bin
a518ec7236dbbc5d2a2dd4a48461af239da7656e8e6bfee581c0555a7bb481ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 5412 bytes
font_01_sfnt_off00012838.bin
c505a84d6a52ea00ea7d653620d690c3bbb22801f3c87ec2e4c2dc7b0340b648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12838 10648 bytes
font_02_sfnt_off00014c5e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5E 4324 bytes

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