Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee85df270484986…

MALICIOUS

PDF

66.1 KB Created: 2020-11-18 22:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1489ae237c9c0231e119ee4c38359881 SHA-1: b32ebbecf4df37e44d68292679131201a29dd6d9 SHA-256: 8ee85df270484986accbe47fb29987b54d67da18aff2b3401590e0c4536eb3de
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/strik?utm_term=anonytun+apk+pro+2.+6 PDF link annotation
    • https://kuliwulakut.weebly.com/uploads/1/3/4/5/134523122/3289072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fa0ed40a1ce4.pdfIn PDF document text
    • https://mejotumuv.weebly.com/uploads/1/3/4/6/134636951/f88ea0c41d908.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/tanagujaburo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_5fa7af5fbf37a.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/3738370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f90483d3ee43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f8af49152e19.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/varim.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/ralonebed-rubisot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/jixubuwiz.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/anime_fighting_jam_wing_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd415e3d-e02d-4ba6-9408-575e8b7ccdb0/5781965527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf737b49-02ca-45ed-bb46-91b861b5eece/full_body_laser_hair_removal_cost_dallas.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_off0000c48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48F 5076 bytes
SHA-256: 507595f74b9a2e86ba6f0d4f15d988b9dc5ef06502c0dd76e6888546d44246ba
font_01_sfnt_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 11244 bytes
SHA-256: 69fd6bd619d979d534be8e655c1f0ac6d83d657785d28f674bcfc62843f39f2c

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