Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b61f4299039770…

MALICIOUS

PDF

87.3 KB Created: 2020-11-22 00:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c9d9febac839675c8fa781718b9dee52 SHA-1: 1b35179dc1b9dbb24cdfc384271d0060a7c3f8e5 SHA-256: d0b61f42990397702ab7755faf257ce5e04e57e4d7e07ca621747244807db5bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, including one pointing to 'trafffe.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to educational content, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/aws?utm_term=multiplying+and+dividing+monomials+coloring+worksheet PDF link annotation
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/difomagab_malifig.pdfIn PDF document text
    • https://fojomuku.weebly.com/uploads/1/3/4/4/134447263/timisozudiwidewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pukasojalu/xipowamofulolugijasus.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/the_process_of_statistical_analysis_in_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/19641268605.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/sejilapotatubukudupino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa523e0-5523-439c-99ce-d4e1e07c7c70/msi_ms_7616_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/cannibals_and_missionaries_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87425a41-9d46-4c0f-93b3-949570c39319/50609231741.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/cooperberg_benjamin_a_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5f8915-867e-4595-8524-85f9bd3ae17f/14908819276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c37e78-7f41-40b5-8eb0-335c1cefdf13/gta_5_installieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701637e5-4334-40b2-a14c-d2b16ae393f5/kenokadalipofafe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 21012 bytes
SHA-256: 26182de3420b9e135c59f6e866b86244ea0d4a64b49f4c3ad84b77674cdf9a8f
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 5692 bytes
SHA-256: 7bcd46e0a7fcb2704a9e9f534dc871c207177b35e854e2711888c1e6e4f73ce1
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 11024 bytes
SHA-256: a696c1fd38090f7b9302f4ca4ffd5afaed2749efd0eb7e43044e300e1d38632b
font_03_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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