Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4eed0bc7691bd7…

MALICIOUS

PDF

81.7 KB Created: 2020-12-25 07:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2904149d3f0a398451be7c11308f2acd SHA-1: 9aefd080574033d34e2c976d0638138184102b7e SHA-256: 8e4eed0bc7691bd764bd2f9779e054fe822536bf2e51a9ef130ddc07a7bb2420
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious or spam content, likely for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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=historia+del+futbol+sala PDF link annotation
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/lewoxujo.pdfIn PDF document text
    • https://dituvilabo.weebly.com/uploads/1/3/4/8/134897320/zotuno.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/9Ryhcif/dalewiwawubavunotazutu.pdfIn PDF document text
    • https://cdn.sqhk.co/jebixusugak/fheidii/jajoloxarelox.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/bexowitaroporo.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/busutafitufe/many_lives_many_masters_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e1086d-6e54-4c23-83eb-3137da86f816/sesame_street_count_dracula_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/60961137818.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/double_displacement_reaction_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/75247684555.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_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 5000 bytes
SHA-256: c0a3e1a30aaafe1a849081569e87e39546bc7c4ffddcbafd2b7bfbeb49098658
font_01_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 10828 bytes
SHA-256: 4abecef420dec93df4424adbdd640f71004cafc986a4fbf85df5eb67d93bebe7

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