Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb308108b77dfd…

MALICIOUS

PDF

76.0 KB Created: 2020-11-14 14:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd7a1c89d761acb7988aeba50fde30b8 SHA-1: 194f424e34f8dd8b51792aff2a8872d56e0cf251 SHA-256: ffcb308108b77dfd28e60576faee4b0130f93fb9b09b9654b32b88fee0e6c2d1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?utm_term=stephen+king%2527+s+it+2017+free+online
    • https://rofuvawe.weebly.com/uploads/1/3/4/3/134363923/deniterafexij_kagefaxemo.pdf
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/7353521.pdf
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/9349747.pdf
    • https://fuxomuvepanagal.weebly.com/uploads/1/3/4/6/134611725/786bb23fd2d39.pdf
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/boboxitikiwogo-wariwudobe-defuzuni-rarakewozazi.pdf
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5f8fe1bdcd85b.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/93180423-67d3-485a-ace8-01804b750a5d/xasovubefawikatagefojuwe.pdf
    • https://uploads.strikinglycdn.com/files/bd75232e-313b-4261-b90e-3538a2dceaca/driver_parallel_lines_downloads.pdf
    • https://uploads.strikinglycdn.com/files/7fc22b5c-45d7-4a3d-bb01-fd968d721007/who_is_the_fastest_growing_army.pdf
    • https://s3.amazonaws.com/zuwimadaneb/76299537618.pdf
    • https://s3.amazonaws.com/pazifetanegapu/nios_deled_506_assignment_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de05.bin
7d31a62adf7389d00d562cd0b8d1b0156c4a23300b41290638991b1daa30b8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 5348 bytes
font_01_sfnt_off0000f041.bin
9e90f21c47e6c168f7ce1cc526ba58278d42a43c69fa0e638fad890495fcea87
pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 10628 bytes
font_02_sfnt_off000114a0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 4324 bytes