Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c6a9b345726937…

MALICIOUS

PDF

72.7 KB Created: 2021-06-03 07:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 224f43223bf282ea704aaa92267f096c SHA-1: f8098a376b63a80cd37e137bf787f6340c33b0eb SHA-256: 44c6a9b345726937afc5f7d278252a4903dafb4b16c5341eab24aaa7b1439457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to a variety of PDF files hosted on different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The embedded URLs suggest a link farm designed to obscure the ultimate destination or to spread malicious content across multiple domains.

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://pixomot.ru/pbw?utm_term=easy+jazz+piano+sheet+music+pdf
    • https://cdn-cms.f-static.net/uploads/4445334/normal_60405e603367c.pdf
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/6752932.pdf
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60122a99a2474.pdf
    • https://cdn-cms.f-static.net/uploads/4375342/normal_6047a41785459.pdf
    • https://foregizof.weebly.com/uploads/1/3/4/8/134890581/7711166.pdf
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5fe8ad8697d71.pdf
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6049ced378540.pdf
    • https://xilizotuxepaxi.weebly.com/uploads/1/3/4/3/134309236/9255390.pdf
    • https://cdn-cms.f-static.net/uploads/4497095/normal_5fda34a6acdd0.pdf
    • https://cdn-cms.f-static.net/uploads/4416326/normal_60185f5d3ba6b.pdf
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/tuxirasusuvewegur.pdf
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/favegusuninevox.pdf
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/xunewaga_vutizurisasos_dimasogufemoxan_xuridexur.pdf
    • https://cdn-cms.f-static.net/uploads/4464303/normal_6049738b3092a.pdf
    • https://cdn-cms.f-static.net/uploads/4457881/normal_602b6b840f34a.pdf
    • https://cdn-cms.f-static.net/uploads/4474750/normal_606d8e897e5eb.pdf
    • https://gexemuxu.weebly.com/uploads/1/3/5/3/135394015/temuvevasabajud.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5fd5febfa1e92.pdf
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5ffba15be23dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000deaf.bin
9b22bbf80c51c2d576a553d36ea48d5bf2a3c46ece55b4da8be7629ef0d31da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 5452 bytes
font_01_sfnt_off0000f136.bin
a7ae4048912effe20748d02bd65227f7874883b7602c8e5e87a6046dc8dc5b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 10716 bytes

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