Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6ea826075b2408…

MALICIOUS

PDF

72.2 KB Created: 2021-02-27 10:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f7209d0e5c2467db09e6cf4439423a2 SHA-1: 1e5d188e7e8c09aa34a7079975d87af28bcf7c40 SHA-256: af6ea826075b2408b0379d77f56222001ae1b5f20c50b6ee11516dd8b94ad476
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('soxebez.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wb?keyword=sharp%20atomic%20clock%20model%20spc364%20manual PDF link annotation
    • http://livecopyrightverification.com/kunixafomudupisoxobstotj.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/7ifgekl/17088858845.pdfIn PDF document text
    • http://halfraire.xyz/cerfa_13750_5_remplissablexoey6.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/hegh4iQ/47802312361.pdfIn PDF document text
    • http://biggymstoe.com/fallen_lauren_kate_ita3izk0.pdfIn PDF document text
    • http://petersikdar.com/jupadadixinawkbe4a.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/7Mhjohe/51583184650.pdfIn PDF document text
    • http://bigmagazin.xyz/what_weight_is_aw32_hydraulic_fluidjfni1.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/MwgjXii/konilopigogufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwolobeduju.rf.gd/41760582038.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/minutes_meeting_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/21688768346.pdfIn PDF document text
    • http://pojetol.epizy.com/golemune.pdfIn PDF document text
    • http://zepibugab.rf.gd/rugged_android_phone_verizon.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/51915953586.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/assassin_s_creed_odyssey_ship_combat_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/36469176643.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_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 5884 bytes
SHA-256: d9c8f73f89099c13a6e392c6561f81b20962ab099a5d61654801d454cc687fb7
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 10688 bytes
SHA-256: c29a650135220debdcb34ebe407d0e0b05bf4d359ec87c73a7a1bed47ea44ec1

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