Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb259cda9c173f6…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 01:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c52ad9c04ac3b1016cd1d485c464fb9 SHA-1: 7b855e199c0f821e231511488373da1151ac70c3 SHA-256: 5fb259cda9c173f63e16699c5b88e740c58a495afdfe82179494ffaba85b5c77
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or content-luring attack pattern, likely delivered as a spearphishing attachment.

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://botokaw.ru/123?utm_term=nigeria+worship+songs+audio
    • http://polikarmonolit.ru/8557249838vbwb5.pdf
    • https://cdn-cms.f-static.net/uploads/4417329/normal_6043852e60b50.pdf
    • https://pakajifovajopif.weebly.com/uploads/1/3/1/6/131607230/mekoladatojedigafi.pdf
    • https://cdn-cms.f-static.net/uploads/4392873/normal_6055fcaa48e92.pdf
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/2d644eec4.pdf
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fc6f61b796f1.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_6017211f0e1bf.pdf
    • https://cdn.sqhk.co/jenotonolo/lfGPngd/fist_of_fury.pdf
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/mogoxajezatuv-sejapexug-ladikavamekama.pdf
    • http://useplafond.xyz/bronchi_definitionmu5jr.pdf
    • https://cdn.sqhk.co/lubometusoz/ibgjWgi/6642294306.pdf
    • https://legelopupusida.weebly.com/uploads/1/3/4/3/134350366/tuzizusojatamujuti.pdf
    • https://cdn.sqhk.co/pugirunosamo/Zexgdjg/hachi_middletown_online_ordering.pdf
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/b5eeed54b61b0.pdf
    • http://top-agent.ru/3733549651820h1m.pdf
    • https://cdn.sqhk.co/pedidagow/iaDMlid/69847234050.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_47025f34c1a3484b8ad6b121e8f5b5f2.pdf?index=true
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_987baac9bed740c58e62ecdfb7fbc527.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_0dd81a1518db43988630940bb8861f1e.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_off0000f08f.bin
0693cfcb2117c880d913997e8949c3377a8a89ce69efde33d3413ecaccc8379e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 5252 bytes
font_01_sfnt_off0001027c.bin
3daa3d4296b4f9d859478d0b4dac119502ff5bfd9da38a0a5c7f008a8b4b28f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 11352 bytes

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