Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6a43ba38724889…

MALICIOUS

PDF

64.8 KB Created: 2020-12-27 18:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8df18be9405a7a910388a97d1795b91e SHA-1: 01dc64888b20870c40b4bf5172f1e53a7b2b0a21 SHA-256: cb6a43ba38724889a7aec3c53c49773ffab8e9ff168253a12d871c0d00fb9de1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs and the heuristic firings strongly indicate that the primary purpose of this document is to redirect users to potentially malicious or unwanted content, likely for phishing or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://trafffi.ru/123?utm_term=isotopes+extra+practice+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5fa892f987a88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fd7b73491c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5fbdeb51a0a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384155/normal_5fc7f2746c884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5fce8f5ea00b8.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/gepuwozil-jonogadamituse.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/7067824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5fd7ab46ba38e.pdfIn PDF document text
    • https://xotagolopotipik.weebly.com/uploads/1/3/4/7/134713968/belem.pdfIn PDF document text
    • https://wilunozuwi.weebly.com/uploads/1/3/4/4/134432110/630489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c353c7-9781-4598-af1d-18061da118ae/13011086315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3a193b-01ea-4e62-b522-c8ef06a40578/themes_in_the_road_cormac_mccarthy.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/el_camino_del_artista_julia_cameron.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 5156 bytes
SHA-256: 6819e84913ea73933a6ea839b8cbc3afc1ce41cf15e442dbe704b2e6f00b953f
font_01_sfnt_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 10252 bytes
SHA-256: be8e0052b956e4d4cf8a0decde7d3daaa8837705876070203847442f2d1524d3

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