Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ca6152e84b5925…

MALICIOUS

PDF

77.6 KB Created: 2020-11-25 11:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c56093fffcf4d134e9d060f1e6d14eb SHA-1: 11f66922f8373a25d699ffda118d8ee1c401c640 SHA-256: 10ca6152e84b592527ffffd54e093e46ea4c96805e224fb17ebb99da59c3681d
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One of the primary indicators is the external URI pointing to 'traffset.ru', which is likely part of a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffset.ru/strik?utm_term=ap+lit+prose+essay+examples+2020
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/0240bfed15064.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/2148444.pdf
    • https://detasove.weebly.com/uploads/1/3/4/5/134594091/7051377.pdf
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/f578670.pdf
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/7002298.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fb4318f2a9a9.pdf
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/634848.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_5fa3e08ab3d5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixawetopoli/27012340113.pdf
    • https://s3.amazonaws.com/vukusa/77900324630.pdf
    • https://s3.amazonaws.com/zidenigad/97476777010.pdf
    • https://uploads.strikinglycdn.com/files/e2d01fe1-576d-4d9d-9fa6-457efc898d10/cardinal_intermediate_directions_worksheet.pdf
    • https://s3.amazonaws.com/jolufozo/samumimozepuwibiwa.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_off0000f146.bin
7c9af04f92dddff0c2b0fb6578bbacb6a889033162ab767cc117df60a45c5ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 5400 bytes
font_01_sfnt_off00010396.bin
910db1fb797d74f2e554f03f1a87d0c5bd49a10185fd5a681a6da3155e53d196
pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 11120 bytes