Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bb9afaf9a40458…

MALICIOUS

PDF

97.7 KB Created: 2021-04-01 07:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98e9e08cee5d10feecc0694e8d9c4a6d SHA-1: b03d45e9e15b8e99c0da8876cad7551b311c07e7 SHA-256: 11bb9afaf9a404585dc0fd058131504d576eaa544586ff87184e9ef1940fead4
104 Risk Score

Malware Insights

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

The file is a PDF containing an external URI pointing to a suspicious domain, and ClamAV detected it as a phishing trojan. The presence of urgency language in the document body further supports a phishing or malicious download lure. While no scripts were explicitly extracted, the PDF structure and external link suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=rl+stine+fear+street+age+level
    • https://cdn-cms.f-static.net/uploads/4374843/normal_60527a3bd9519.pdf
    • https://cdn.sqhk.co/gabixeme/sDicFvP/9603267375.pdf
    • https://cdn-cms.f-static.net/uploads/4447640/normal_604fbed7b46f9.pdf
    • https://cdn.sqhk.co/moturalogupe/88haJAY/11654967528.pdf
    • http://amorexpo.com/tevivamixlmb5e.pdf
    • https://cdn.sqhk.co/vapatibu/hNTpX0U/23659450849.pdf
    • http://ig-verifiedsbadge.com/1020786685s4ljf.pdf
    • https://cdn.sqhk.co/nakijalufiw/hihRUZY/stickman_battle_fight_superhero_stick_fighting_mod_apk.pdf
    • http://smartline58.ru/ap_10th_marks_memo_20146rl4i.pdf
    • https://cdn.sqhk.co/nadetajagupe/WCRMVge/81107384414.pdf
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c1d20d7f.pdf
    • https://cdn.sqhk.co/zebenane/ngfhhjb/facebook_lite_download.pdf
    • https://cdn.sqhk.co/zivuzigup/icjcg0j/triple_cross_fishtail_loom_band.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_0c3a7ce5cac3424699c2964addc86cbf.pdf?index=true
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_75e944c3f84c4a028054156b970394c1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001410d.bin
de232687090759976f65383d62825c7af83296e3799ec406b1912bc537788472
pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 5000 bytes
font_01_sfnt_off00015232.bin
b1508c3c68378753a7c0a47e48dbbcd9b545b4aebf553c3c0bac0369aadd0c35
pdf-font-stream PDF embedded font (sfnt) at offset 0x15232 11416 bytes