Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d1772a5d0b71d0…

MALICIOUS

PDF

85.0 KB Created: 2021-06-04 09:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6226428d607af9cf7c418979583d8a36 SHA-1: c30c30be3d7187acaa5a6cb775a62a90b0dba95e SHA-256: 41d1772a5d0b71d0ae5ceee0362f8dc8b9581ae4f6644e6786c36866ca89d739
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the primary goal is to redirect users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/123?utm_term=binaural+beats+concentration+free
    • https://cdn-cms.f-static.net/uploads/4366007/normal_6051851acbdf9.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_606b33c0cca33.pdf
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/xuwidopejonev_fedefigoke_dadumunepozu_pemosidufurem.pdf
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fd90e397f2b5.pdf
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff7bab05c8b1.pdf
    • https://static.s123-cdn-static.com/uploads/4393346/normal_60063c1a69575.pdf
    • https://cdn-cms.f-static.net/uploads/4450896/normal_6065a146d3a7a.pdf
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6010cf1cd6337.pdf
    • https://static.s123-cdn-static-d.com/uploads/4448744/normal_60b14d63f3b83.pdf
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fe55a5652ca4.pdf
    • https://cdn-cms.f-static.net/uploads/4491432/normal_60467073740e0.pdf
    • https://cdn-cms.f-static.net/uploads/4486523/normal_605fa13193f97.pdf
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ffc49f23528d.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_606b625fbd277.pdf
    • https://static.s123-cdn-static.com/uploads/4383692/normal_5fd098758884b.pdf
    • https://cdn-cms.f-static.net/uploads/4494136/normal_601368204daf5.pdf
    • https://cdn-cms.f-static.net/uploads/4387931/normal_606e0b7980568.pdf
    • https://nokodemi.weebly.com/uploads/1/3/4/0/134042357/ce09f8.pdf
    • https://cdn-cms.f-static.net/uploads/4413705/normal_6024a4ba99ce4.pdf
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fd083c30a226.pdf
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/1ee8195854b42f.pdf
    • https://cdn-cms.f-static.net/uploads/4464525/normal_606446fa498f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacd.bin
85f61c3994fc0a3b244c49dbb12a3290b6b56f456f6e78eb5ce26c4a3564d480		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 4948 bytes
font_01_sfnt_off0000fb9c.bin
8864def83e9996dbcb943fdc387b364ed354dfaf2dc27f663c8fedc947412f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 11300 bytes
font_02_sfnt_off00012235.bin
ccb13d41afe21ee89e53c3f27717ac94378910443654e14806548dbd4f8047b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16256 bytes
font_03_sfnt_off00013793.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 4324 bytes

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