Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7338f0d010e9a16…

MALICIOUS

PDF

78.8 KB Created: 2021-02-21 23:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 35960d712fa75cc3d270c19acffbff1d SHA-1: fc381faec00abc0c93c064dbf611a32f2ade65ac SHA-256: c7338f0d010e9a16717a037905fba9c1eec2a829cdc043cad7b6f1e75668448a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'seumenha.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/wix?keyword=la+insoportable+levedad+del+ser.pdf PDF link annotation
    • https://cdn.sqhk.co/gubogezemazo/ifyzpKO/wood_rope_and_ring_puzzle_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/zeragekub/8ijMQEI/32597301369.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/cIaoheq/spades_rules_nil.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/82wvNja/funny_ringtone_for_boyfriend_download_pagalworld.pdfIn PDF document text
    • http://erethiztzj.space/ap_agriculture_budget_2019-_20v6vu1.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ig9DTgh/best_ninja_turtles_shows.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5ff88637a4533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/mexegovosuwedutavep.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/62480398267.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/linapa.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/fufadukeditimomekojefi.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/acrylic_plastic_sheet_cut_to_size.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 5208 bytes
SHA-256: b5a7a728e93872260c4688b4389f5bd760ac13a5e7da72348b5ec5cdf7bd7052
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 11536 bytes
SHA-256: ebd9e03d3bb3de9933ee885d1cdc1329a5b3ed4265f72dba5d79676d4bad62b4