Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8840d3a280364cc…

MALICIOUS

PDF

70.8 KB Created: 2020-12-30 11:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a2345cbe802b7d6d296b0d7569afabba SHA-1: 9525a545e181dde38b9f3753c92431b137458ce3 SHA-256: f8840d3a280364cc863ef1f30a31a95080a1a4ef3487772b126366e5f45450bb
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating an image lure linked to an SEO redirector, pointing to the URL https://traffset.ru/123?utm_term=most+common+latin+verbs. This URL is likely part of a phishing campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffset.ru/123?utm_term=most+common+latin+verbs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fd7ac70ef385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd30906c0e15.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/guwutivupudutu/prepositions_of_place_worksheets_for_esl_students.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/tinker_s_tools_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/battleship_mobile_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/ganixufalopiwulodeleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328f90b6-4f24-4640-b125-99a675905c45/56545152716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c9d76f-8ef5-4468-a917-d5667ede69a7/punawalitogunidiw.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/8937637735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4754c7-5802-4270-99ea-3f5eddc66d8f/tunexixexazolinotutajo.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/virifirekamefow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7cb8cf-afb5-41e8-9fba-3d81ce8f841a/ejemplo_de_un_guion_radiofonico.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 5152 bytes
SHA-256: 1c40a3cea2b5e9631eb8571f8c7480eae03c34534c14206546a0e827b7fc97dc
font_01_sfnt_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 10088 bytes
SHA-256: dafac4a4410ea31f0365d0348edf7c792a975b39f4d12a7f43f787d021f8a8f9

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