Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac4e2955c467189…

MALICIOUS

PDF

72.5 KB Created: 2021-02-16 16:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 50bf71d6b654ecb624160577d13ac934 SHA-1: 2f6361b9887494f22c61694178a6607ab16d1625 SHA-256: 4ac4e2955c467189871d5ff0fb2ddc99805ad37a309daebdd52bdfd9e0e2f679
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It 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, suggests a lure related to academic or informational content to mask the malicious intent. No scripts were extracted, but the presence of multiple embedded URLs indicates a strong likelihood of directing users to malicious content.

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/wb?keyword=what%20is%20the%20exigence%20of%20letter%20from%20birmingham%20jail PDF link annotation
    • https://cdn.sqhk.co/nekuripafi/dPY9heT/51268788075.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/dnJVghq/30319093262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fc952f624f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6020fb3e5fe53.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ihF06TJ/crazy_minecraft_survival_pocket_edition_servers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_601ddf5be59bc.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/aWgegdh/super_idle_hero_lumberjack_adventure_pigeon_forge_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/W6TMija/savings_goal_calculator_moneysmart.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/ibuEkgg/foil_turning_3d_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5feafe0bc7d7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383791/normal_5ffabd3d21faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5ffebdf018c56.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/Jlojffj/xewojewederozuluxob.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/aMuCpgf/xebovojuxopukolufad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5fe7bb9ba19dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5ffa0c9d14472.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/yaifrhZ/off_road_racing_3d_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 5592 bytes
SHA-256: 4279536432975a11e4545eaad2c9c872f7e67b571519f95b93e65e6f13bc0d01
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10140 bytes
SHA-256: d5ab498bd41d9bf7a75627c7ea2423893e7eee5500964bc2ee6963019563a23c

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