Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fe8b64cb7c0457…

MALICIOUS

PDF

69.6 KB Created: 2020-11-23 11:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: def9756ec46c7fbb3d45337ac249abc1 SHA-1: 93b54264eed19cee9e3c7193e436b0c4cd7e0e22 SHA-256: 28fe8b64cb7c0457dd2215e35d47dfd434e6b039b5c41879e52941697dbd30f2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://gettraff.ru/strik?utm_term=free+half+apron+patterns', is identified as a malicious redirector, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=free+half+apron+patterns In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fad2e334d411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5f92d9ded97e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f8f2fa50a3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f91e10d592e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_5fb02470ce64e.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/5486653.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/0d423707-0dfd-4098-b698-24935467002d/diruj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbef10b5-9ebd-4e2b-8773-72f2edc526f4/jegiwegurafolovipirodoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7ba361-e381-48ce-983b-97388929d9e6/dafunapomagurodazukom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47962f8-b62a-43b2-aec9-71f91257d2e5/vigejovefewaxuxavusim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a52dd9-d57a-45fe-8760-f8ed01bd9cf5/biology_objective_questions_for_neet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44fd5abe-37fa-450c-a54f-bb95b74b7f69/47746507467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf25741b-5c17-4474-a3d3-434870fb2eaf/67549841588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24a3a8a-f6aa-4ad2-b919-3fbf218c0231/fishes_an_introduction_to_ichthyolog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b59593f-2d0d-45c5-9480-490d04494e54/52054889500.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 4944 bytes
SHA-256: da2e22040c884765f25cd7507dd7c7324873a3c608422899a1d9430cf5268fcf
font_01_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 10264 bytes
SHA-256: 25af6e1947300b2d13d6fba4454ab1824ef1c07015eb58be8a08a989e38074fe

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