Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be6b7e4918c82e2…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 04:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28acd2e5622b37c109c2cced52686de2 SHA-1: 72b138ec8ff5501af498d1626f11e249382d6cb6 SHA-256: 8be6b7e4918c82e23286852326d7f5c7ef35bca1c3f53c51b1a743b6b9ea0ee2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

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://maypoin.ru/wix?keyword=audiovox+user+manual
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/talitad.pdf
    • https://cdn-cms.f-static.net/uploads/4382208/normal_60481bb22e338.pdf
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5ffbb3b0cdf74.pdf
    • https://cdn-cms.f-static.net/uploads/4422918/normal_603094dae5f99.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6018be771be5e.pdf
    • https://cdn-cms.f-static.net/uploads/4372087/normal_603730620e0fc.pdf
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc92dc9304af.pdf
    • https://cdn-cms.f-static.net/uploads/4367287/normal_6046ff977a621.pdf
    • https://cdn-cms.f-static.net/uploads/4480594/normal_602d782f951a3.pdf
    • https://static.s123-cdn-static.com/uploads/4466153/normal_5fdea35aa7f1d.pdf
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5fd2ee3dd253b.pdf
    • https://cdn-cms.f-static.net/uploads/4495039/normal_600e278ca4622.pdf
    • https://cdn-cms.f-static.net/uploads/4367919/normal_601834608979f.pdf
    • https://cdn-cms.f-static.net/uploads/4417644/normal_6011ee9e7d1f1.pdf
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5fdab78ef2a2d.pdf
    • https://cdn-cms.f-static.net/uploads/4402262/normal_60170d4e1afbe.pdf
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/6869196.pdf
    • https://cdn-cms.f-static.net/uploads/4449604/normal_6024039ad3a67.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/5a683.pdf
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/tibevowojev_xepakip_tejoxedifizef.pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_6025cd868948c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_2a8214ec91d34571ac955b086b48f18f.pdf?index=true
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_d4f072208231436ca6d827c2a5c38cd0.pdf?index=true
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_d4f278117d0e452bbd54a75bb8cab36c.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_off000100c5.bin
461e5cccd7354741c99a9a617ac24fb49e43d7db119724df1f33b4707bc53df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 5088 bytes
font_01_sfnt_off000111fe.bin
3e93a2f6424b55ccc8d41f0bab5da7d4e58f445013f9aaba3912ee20e4814acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 11476 bytes

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