Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb1a2c46268d2f4…

MALICIOUS

PDF

69.7 KB Created: 2020-12-15 03:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abe28fb145e772ae194b0f2559c609cd SHA-1: 111d5d621e76a092e056856891a4d4fd4cb005ff SHA-256: ecb1a2c46268d2f4de64229a6381bfd4bc70ee13897fe57d311fa4db1878c64f
136 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. It contains an embedded URL pointing to 'trafffe.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains fragments related to product names and application details, suggesting a lure to disguise the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffe.ru/strik?utm_term=chi+curling+iron+1.5+inch
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8be0198f065.pdf
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f8ce04317c97.pdf
    • https://s3.amazonaws
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zonivezada/bitter_leaf_plant.pdf
    • https://static1.squarespace.com/static/5fc0f4a62e34347c70445090/t/5fc1660a9d79364840c219c6/1606510090423/73893573934.pdf
    • https://s3.amazonaws.com/gupuso/3225632088.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1c3643516d6aa83e0ca2/1606229049253/sasufikuremob.pdf
    • https://s3.amazonaws.com/janodojivi/blair_witch_walkthrough_guide.pdf
    • https://s3.amazonaws.com/sefipa/3263846042.pdf
    • https://static1.squarespace.com/static/5fc5af41a3bf4b14abc9db24/t/5fcd7228c836a917f921b64e/1607299624319/red_button_up_dress_shirt.pdf
    • https://static1.squarespace.com/static/5fc021705e8e827d4289a3fa/t/5fc0e36d9d79364840ae1d4c/1606476653933/44312104107.pdf
    • https://uploads.strikinglycdn.com/files/aef590e7-c03e-4abd-8821-e957028efb53/33684112124.pdf
    • https://s3.amazonaws.com/wewuxuviwar/kugami.pdf
    • https://static1.squarespace.com/static/5fbfe7e212facd59cea75dab/t/5fc86ee06652ad59ec28fc31/1606971108097/30226358578.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_off0000d5fa.bin
3ab348bc964e7cb8b0ec730ceccc1451cacc1b8c2f2714dbceb40d60235b52cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 4784 bytes
font_01_sfnt_off0000e644.bin
efec123a87ba57f511de8021463ef8906a45bdfebab9d79c3a5d41129b23371e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 10544 bytes