Malicious PDF — malware analysis report

Static analysis result for SHA-256 00774c880d3fa0bc…

MALICIOUS

PDF

63.4 KB Created: 2020-11-14 19:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c450b3fa9cb169c2f757c2ed1cecbde SHA-1: 536e3037c81b106c38697078d4204fa7f3660eae SHA-256: 00774c880d3fa0bcf824ffcadb84e43dec1487b4be91eb524074d0f6e61d0e59
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It functions as a link farm, containing numerous external URIs that redirect to various websites, likely for phishing or malware distribution. The presence of multiple external links on disposable hosting services further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=said+culture+and+imperialism+pdf
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/barevobevenijumolus.pdf
    • https://pozitolize.weebly.com/uploads/1/3/4/3/134330731/romejugi.pdf
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f9cf0bb981ba.pdf
    • https://sebijulevezokoj.weebly.com/uploads/1/3/4/5/134512917/ropelivirase.pdf
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/2906120.pdf
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/tigokuzete-diteropib.pdf
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/wukobodosi-zorovudesi.pdf
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f9011cd4a989.pdf
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/1cb9894be10.pdf
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/zagubi_fowujixaso_podog_gomapifovep.pdf
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/sakowifupetizut-jemalotugiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000bd3d.bin
621e301f0bd7be73dc0192568dfb429077286d1b72c5623bfd709a1fe115b657		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 5404 bytes
font_01_sfnt_off0000cf86.bin
be907cffa5eb8ee96f9b3eb5ddc90da4bc44920a4afca576793ab6dc6ec2ea7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 9888 bytes

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