Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c72ac3be5bcef2b…

MALICIOUS

PDF

77.7 KB Created: 2021-04-22 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bcac1d30ce659887930f0c5279e173c SHA-1: bc922819867a5cc4d9a5ce46a9a4e88141357e26 SHA-256: 6c72ac3be5bcef2badd702b5435b8db52f6ef1f8c8a59f53eb4d7b267175c493
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains multiple embedded URLs, with the primary one being https://jacksth.ru/strik, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=apc+back-ups+es+550+manual
    • http://zvezdasevera.online/wufakavuwajujeid17b.pdf
    • https://cdn.sqhk.co/xovepejegosi/nggzibi/cut_the_rope_unblocked_66.pdf
    • http://hd-cam-mirror-up1.club/18211775110esp8u.pdf
    • https://cdn.sqhk.co/folamudoj/fegj9gf/motor_racing_mania_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/juwafajem/jEjejg2/disney_ravensburger_puzzle_1000_big_w.pdf
    • https://cdn.sqhk.co/litawoxelida/gjZBQjb/76073040660.pdf
    • https://cdn-cms.f-static.net/uploads/4472484/normal_606b4539d100c.pdf
    • https://cdn-cms.f-static.net/uploads/4407318/normal_60464e86e2056.pdf
    • https://cdn.sqhk.co/nibidawe/gsibiSh/bombay_movie_video_songs_free.pdf
    • https://cdn.sqhk.co/busoleva/cA0nJgh/95526954706.pdf
    • https://static.s123-cdn-static.com/uploads/4407070/normal_5fc5c0a814ef2.pdf
    • https://cdn.sqhk.co/kupujape/iaS6Nhh/jizamipezuvadopir.pdf
    • https://cdn-cms.f-static.net/uploads/4403273/normal_603016ae5c53a.pdf
    • https://cdn.sqhk.co/jotenitix/ij8Xiie/best_chinese_kung_fu_drama_2018.pdf
    • http://pollsexpert.com/pabozejifu074m2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/334c5903-4a0a-481d-9aa9-e6d9c68de6f4/gluten_free_snack_recipes_uk.pdf
    • https://uploads.strikinglycdn.com/files/2fa05de0-58d4-48fe-a42c-d7b196bf01e5/learn_english_grammar_in_hindi_online.pdf
    • https://uploads.strikinglycdn.com/files/9be9c8e8-8267-43f1-9adb-787e9c2c318f/does_the_last_of_us_2_have_multiple_endings.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec20.bin
9bbbada2d2979ac76ac0d06ff1aa43fcac783e8395549b057a0188b1c18c5abf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5472 bytes
font_01_sfnt_off0000feb8.bin
6a189ce9d26afe81e434a493cba0d4fd4fe1f93d48f19b8d6404cdd65490ffaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 14336 bytes