Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ce731e0ae4191b…

MALICIOUS

PDF

86.1 KB Created: 2021-03-30 06:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6437ac6787c4033d3fdc43a3b1a3cccf SHA-1: a7712731e3ded6092d38074c71efbdc5a94d0cd9 SHA-256: d0ce731e0ae4191b2c0714d049f96c48bb720c45fae5866910cacf155dec1835
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF structure suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=all+aikido+techniques+pdf
    • https://visorupa.weebly.com/uploads/1/3/5/3/135305290/suvasajubawesebox.pdf
    • http://miromawetibikew.mywebcommunity.org/9455240385.pdf
    • http://vonoxafaku.scienceontheweb.net/types_of_cells_in_the_body.pdf
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/a6420.pdf
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/xidajaw_ledebutazomenu_pomebud.pdf
    • https://cdn-cms.f-static.net/uploads/4445114/normal_60134088559df.pdf
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fed52b0f0c1c.pdf
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/viligepini-nikan.pdf
    • https://cdn-cms.f-static.net/uploads/4382960/normal_60201c7198aaa.pdf
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5ff94e8057e71.pdf
    • http://wifisef.medianewsonline.com/sample_appointment_letter.pdf
    • https://static.s123-cdn-static.com/uploads/4415936/normal_6002e74fb401b.pdf
    • https://cdn-cms.f-static.net/uploads/4470218/normal_602d945a3d780.pdf
    • https://kaseledewa.weebly.com/uploads/1/3/2/6/132682802/vexowefirozez-tolazitebepu-kopuxajoxasod-fevofal.pdf
    • http://ritefajitexu.scienceontheweb.net/os_argonautas_livro.pdf
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6018daa34ee46.pdf
    • https://cdn-cms.f-static.net/uploads/4490122/normal_5fd84877e2cfd.pdf
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5fffbdccc1948.pdf
    • http://bisewilorilamej.sportsontheweb.net/jarujufewolijajuzagedez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_e1d20b7e6023410a8a5bcee38209ca0a.pdf?index=true
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_d85f234b62264ca2bc5d171ddbd9b60c.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_off0001142c.bin
d47440a6fd21a3098130281cb01800c91d0a07798587a0f3a19a5142a622117a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 5328 bytes
font_01_sfnt_off00012649.bin
78afaf301fb4cad352e067b8b782cca13b0a8251852ba9522f8a9520fff18fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 10756 bytes

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