Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5e10789cb692fe…

MALICIOUS

PDF

68.8 KB Created: 2021-02-20 22:37:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb50198cfa23048ac78c58f8c78a9a36 SHA-1: 350afbd324f208fc3bc613225690464315bdc9e7 SHA-256: 7c5e10789cb692feb676372dc5cad58898a7129838245ab5070f814caf14df91
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a domain that appears to be part of a phishing or scam operation, disguised as a search result for educational material. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to appear as a legitimate document.

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=law+of+conservation+of+mass+worksheet+answers+key PDF link annotation
    • https://cdn.sqhk.co/fijajiles/Tidgehg/fixemewoteba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_60256205338f7.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/hiTidjh/3d_tale_sans_fight.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwokosokif/4EGgju4/wobamafixixe.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/iHiePKc/webtoon_free_coins_without_human_verification.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/OigeijW/house_life_3d_game_level_64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_5fdb0053c783c.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/rkLjdje/kaluzubagonikowuvavopipe.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/CoifhfI/pet_pals_santa_cruz_california.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/ka2NHib/best_game_development_engine_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/foojhQ5/18570520427.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/naxozelozude/vepuwotowigovegiwer.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_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 5348 bytes
SHA-256: a992469b42791d8e9653bc685f8c682ae62c5bb40bbdf6519717ce57105c2df2
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 10068 bytes
SHA-256: 1d66a7f79a29a8bdc79fa6fc44cbb9e124dd0b3ebb5a609c6432ebe597087b26