Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf06fce9076ab92…

MALICIOUS

PDF

76.0 KB Created: 2021-05-23 22:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1a4edc28d9f38489d82865cd24829bfb SHA-1: 22bdba89f6cf3a48a14b00d9a34bf03a781563bd SHA-256: 8cf06fce9076ab924d88db6069a0dae9baada0724b912102a1d4a2ac1ae8f5a8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heuristics indicating it is a phishing lure and a link farm, directing users to external URLs. The primary URL, 'https://fokemale.ru/strik?utm_term=how+to+enable+alexa+on+bose+home+speaker+300', is part of an SEO redirector, suggesting a phishing or malicious content delivery mechanism. The presence of ClamAV detection and ML classification further supports its malicious nature, likely exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=how+to+enable+alexa+on+bose+home+speaker+300 PDF link annotation
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/dikimakazejibizewiva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fdd41f94df63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_602e9b8540dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_604862a3c64a4.pdfIn PDF document text
    • https://wogazisaralo.weebly.com/uploads/1/3/1/1/131163660/1067025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_603916eae47a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ffeb7fbc18e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_60195288d659e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5feec53141b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485929/normal_60359f0b65319.pdfIn PDF document text
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/regurol-butenaduj-toges-pipumesega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_605ddb2911e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_60385848ec511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_6036aa35f3003.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/pululusodogi/20753424147.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/xiredarazadimojotozegi.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/solving_quadratics_review_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/ximegobediwubarawabaz.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/2763293057.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/jelagajiwaxetaxilobix.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/notakevinitejinomusukevoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/38568341577.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_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 5688 bytes
SHA-256: 0f9bf20d566226265216b31a9e4e52e05579ca49a413c997cb8ffc7023fa9579
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10736 bytes
SHA-256: e48b80e9a143c7ae30e84ab8fcc22d9bed1fabfbc5a478b659f9b1e3ef63d089