Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86aa65ff53a2d54…

MALICIOUS

PDF

70.5 KB Created: 2020-12-30 05:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b857a6f3a9ddf6ee2f60e58a68ecaccc SHA-1: bc30bb32a38eee9a0caacf9b8ed87147e680615c SHA-256: c86aa65ff53a2d549b9f6ff7a02032acd855bcb1f1573aed5b7993ccd793bdb3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a spearphishing attachment to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=spotter+guide+nascar PDF link annotation
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/lokiragasige.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/totuwazizumeves_fonivubes_popasoduruvura_jokijalita.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/7a187234.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/haLgihf/red_balloon_movie_scary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5fdfcacf897ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f992a6660bbe.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/bumelikezowamufir.pdfIn PDF document text
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/3441183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445331/normal_5fc2687513af8.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/a2d7342f-e7f1-4d4e-9ce4-45d1811a4b53/35300288469.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/bteup_marksheet_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/carsguide_best_midsize_suv.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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 5312 bytes
SHA-256: 9c738c334e1fcc8144898a6f3253c43c240a642ed5ffeeaa9810080847a56259
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10248 bytes
SHA-256: 9db09c855e07514ae4c1d3689bda9af68046fcf1b3136e8ff3ecf2d0f11a7a1b

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