Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338f61b786caeda…

MALICIOUS

PDF

77.7 KB Created: 2021-01-20 15:36:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6ac73c97993f89f7644ff5bdd6748058 SHA-1: 96eaf195a9e841d5fd24527c9c2f4e1329d9c519 SHA-256: d338f61b786caeda10101c641496ffa81c6fcfeaafaed9c42f4b4d4e54b64d0e
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. 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, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

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/123?utm_term=medical+school+personal+statement+examples+stanford PDF link annotation
    • https://site-1180855.mozfiles.com/files/1180855/cecilia_marfo_new_song.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/6ZWgjdE/vogidira.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/jeus1bM/10208477617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenuzuwemonuda.epizy.com/43242705092.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/infocomm_av_design_reference_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/51900842238.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/setting_up_guided_access_on_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/teaching_philosophy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/battle_trip_jeno_jaemin.pdfIn PDF document text
    • http://zopatirek.epizy.com/36146815276.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/arabic_english_dictionary_hans_wehr.pdfIn PDF document text
    • http://setuvufijub.epizy.com/legal_profession_uniform_admission_rules_2015_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/crochet_stitches_guide_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/bushnell_24mp_trophy_cam_hd_manual.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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5468 bytes
SHA-256: 24cad3450a75871fd2f63f9c55dde91e15217f17fec32a901a25f0c32ac9ac81
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10856 bytes
SHA-256: b26a350f74c9084d5dfa3a3174b1a3e7fe23d9b845fb2aa926db07206445b30f

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