Malicious PDF — malware analysis report

Static analysis result for SHA-256 231b2b0bceb50cc4…

MALICIOUS

PDF

70.3 KB Created: 2020-12-07 06:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6e7de74ff49f7497308e0520161eb6c6 SHA-1: 278ec0cf853c8902d0c80b3ce6b35f49cd7ef33e SHA-256: 231b2b0bceb50cc4a05e2202bcdf870eb01025db2d5bbd2b15fa49bbf628a378
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/strik?utm_term=download+spotify+premium+mod+apk+terbaru+no+root In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501991/normal_5fafa738b9108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_5f90458f7a174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_5fbd5cbd85a32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/eb1819eb-d92e-49d6-91a2-d82bd0fe802a/40515313145.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/82406024181.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/41347348070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a0ffd4-603c-4d2c-880d-1f9e90bbb2b1/2894991778.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fc261b4cb3e0f57719d1f55/1606574516690/drivers_ed_textbook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfdbd45ca4f7902665d52/1606221246737/palo_verde_middle_school_yearbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 5464 bytes
SHA-256: f34447c838965d35802d33174896b6d9516140115b0efc9685938e5af8bc0eb1
font_01_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10648 bytes
SHA-256: ebe222d432137ba96d41dcb3614ab8cb28d4cbad24b57e71131d19e68ce9301e
font_02_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378