Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9a0a4d3bb26b2…

MALICIOUS

PDF

120.8 KB Created: 2021-05-17 01:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af4b3447924bc6e35548965736f51d0 SHA-1: 50ab883b0b4b496541c98a100f01c12bc497cd7b SHA-256: b6b9a0a4d3bb26b202b9a1975ceae1c3f4dc264880671a78cd295057db489255
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a malicious domain, likely intended to deliver a phishing lure or a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to a game expansion pack, suggesting a social engineering pretext.

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://kuzutuzo.ru/strik?utm_term=donkey+kong+64+expansion+pack+bug
    • http://shopmzm.site/nudodugex44ezn.pdf
    • http://topmassage.net/7840770748dttjb.pdf
    • http://online-sistem.site/45184904917t7zst.pdf
    • http://lnstagram-blue-badge-form.com/the_bulletproof_diet_cookbookjy141.pdf
    • https://cdn-cms.f-static.net/uploads/4470537/normal_600aca1f1d3a3.pdf
    • https://static.s123-cdn-static.com/uploads/4421473/normal_5ff978940c35a.pdf
    • https://cdn-cms.f-static.net/uploads/4467912/normal_5fd81af41380f.pdf
    • http://goproits.com/tribal_leadership_by_david_logan1s16p.pdf
    • http://form-lnstagramcopyrightservice.com/psicofarmacologia_victor_uriarte_desjv7eb.pdf
    • http://ukrdomonis.xyz/chemistry_chapter_4_and_5_test_review533w6.pdf
    • https://cdn-cms.f-static.net/uploads/4369912/normal_601e3ff26c3af.pdf
    • https://cdn-cms.f-static.net/uploads/4455178/normal_604515a0bf500.pdf
    • https://cdn-cms.f-static.net/uploads/4403120/normal_603d07b0bdf92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_0b801ae16a5c46c0aa89ed3b3329c5d5.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_0460e249386f4d1d8487ecf6ce03d473.pdf?index=true
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_eebef7cfe7ad4237b16ae778ba8ef6ea.pdf?index=true
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_e918c705b5f84909ab76355a5aa4259a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015156.bin
e601d064dd8bc983366144ca6619137d56657e5680dec4f1e245fa566c0f0579
pdf-font-stream PDF embedded font (sfnt) at offset 0x15156 22548 bytes
font_01_sfnt_off00019834.bin
1dc81a52bad6a86b00737ffc05558f56e044bf93256e871e00c78da41aae622b
pdf-font-stream PDF embedded font (sfnt) at offset 0x19834 5588 bytes
font_02_sfnt_off0001ab78.bin
0e9cd66c865d4e570c6fd676e9dd18a5dfc788d76acc462342c5018a36d99363
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB78 12912 bytes