Malicious PDF — malware analysis report

Static analysis result for SHA-256 560353cf8cfdf541…

MALICIOUS

PDF

74.8 KB Created: 2021-03-21 11:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c29db12caba7f3bf870e9e8e57e24691 SHA-1: 15200d889236caa73d4965c7b9f48673ff89766d SHA-256: 560353cf8cfdf541f375a487b85e686121ef4e88220e22d5c31f97d1dfffacee
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to boost SEO, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. The presence of embedded URLs and the 'enable lure' heuristic further support that this document is designed to trick users into navigating to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://mezovuduw.ru/award?keyword=convert+pdf+into+word+file+free+online
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/xemiroluxa-vojuji-tidasizuzu.pdf
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5ff07b1caf0a6.pdf
    • http://kdghy.online/dynamic_tension_charles_atlasn70wx.pdf
    • https://static.s123-cdn-static.com/uploads/4461525/normal_5fca39eb33f20.pdf
    • https://cdn-cms.f-static.net/uploads/4503390/normal_60413c5a6e428.pdf
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/watinelosapu.pdf
    • https://cdn-cms.f-static.net/uploads/4470821/normal_6048424d9c403.pdf
    • http://atomlinux.com/ifttt_alexa_skill21ycx.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_604854e70c25a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da6e0b91-775b-4ab8-a7dc-1d1650ec8e8c/99903461600.pdf
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_c09f2cd0531b43cb8407cb1c7b7f9bd5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74f38d42-f94b-4134-98cb-4545b97adc1d/7-3_practice_similar_triangles_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/71617a5c-47bc-4f47-b846-47148962f943/18788256317.pdf
    • https://uploads.strikinglycdn.com/files/3d4fc5e3-bea5-4c6b-ad91-fc47460e5ae8/chicago_airport_fedex_drop_off.pdf
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_32cee3e80b024e1f9cdeddc35d54cb41.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_off0000e8a6.bin
b16436f17128922ab6347838571dd7820cfe05745debe327daaf2d520b11138c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 4704 bytes
font_01_sfnt_off0000f8cd.bin
a35618f0a9c766d9e08c6161219276004af87493cc4efe8d9de0327f7c0f29ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10884 bytes

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