Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9142332e900526…

MALICIOUS

PDF

89.3 KB Created: 2021-04-03 00:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3667396dee168efbbf61e8055e5490e2 SHA-1: d224c66c22db891418a349a4362ab940d1f834f1 SHA-256: 7f9142332e9005260c45b71d89eb58026c96e4e6b681270a82544f99322a51aa
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with the primary link pointing to a URL that appears to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of 30 external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of a phishing or SEO-based malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=traductor+portugues+espa%25C3%25B1ol+pdf
    • https://cdn-cms.f-static.net/uploads/4428341/normal_6021011bcd266.pdf
    • https://cdn.sqhk.co/manowipete/s7Txxhb/academic_ielts_speaking_topics_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4425224/normal_605923128d0a9.pdf
    • https://cdn-cms.f-static.net/uploads/4413585/normal_601ada7b92189.pdf
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/9809986.pdf
    • https://static.s123-cdn-static.com/uploads/4476275/normal_600915ed9b061.pdf
    • https://kobipisi.weebly.com/uploads/1/3/4/3/134312725/3342247.pdf
    • https://cdn-cms.f-static.net/uploads/4383295/normal_603595159651c.pdf
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5fec6c72225d4.pdf
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604d1c9e64d86.pdf
    • https://cdn.sqhk.co/tevosudav/hfihugh/buzzer_beater_manga_ending.pdf
    • https://cdn.sqhk.co/gipudeviwapi/fhdBXji/circuit_electrique_interrupteur_lampe.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/wuxapogibe.pdf
    • https://cdn.sqhk.co/zexetiminav/cieghtg/33947028177.pdf
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6015e9a633f9a.pdf
    • https://cdn.sqhk.co/wudenedu/gge8hgu/92386710220.pdf
    • https://cdn.sqhk.co/tamaladafa/gcMOCgi/hungry_shark_evolution_hack_tool_download.pdf
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/vavurevolizudom.pdf
    • https://cdn.sqhk.co/tisezalave/ifhejaM/27120352763.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/votawawo/lozuridapotebomomomug.pdf
    • https://s3.amazonaws.com/zoromexemuzid/6402249662.pdf
    • https://s3.amazonaws.com/xasovewipeje/shooting_star_candlestick_formation.pdf
    • https://s3.amazonaws.com/remavuj/16526469249.pdf
    • https://s3.amazonaws.com/dewutexorob/jar_of_hearts_sheet_music_with_lyrics.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e056.bin
6dbd0fd4abd7d40a28b3559a50b626f228cea2cbffb30443030bc153b5d5893a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 5028 bytes
font_01_sfnt_off0000f1e5.bin
4d52b72630a1ebae660ad4a95303671e6ffe529fb10dd873d5039a2cabc21430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 5212 bytes
font_02_sfnt_off000103a7.bin
c3d1b395b339bc7f82d6a987d8595e624cf861ebcd8767c97783f006d02a7bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 14128 bytes
font_03_sfnt_off00012f2f.bin
1103ed739ee933748a1a8a87780b4e0e6892bccab2e547c4de21d1708c70e035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 16764 bytes
font_04_sfnt_off000146c4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146C4 4324 bytes

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