Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a33361ce6524cb7…

MALICIOUS

PDF

66.8 KB Created: 2021-01-01 02:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2561768d85c30ff95c9ee596141cdca SHA-1: 148e69052d9c82ba470aee31269ef17fe43a3329 SHA-256: 2a33361ce6524cb7947d89e5f34a2600cd09cd7a2ccabd058aed94d1227edb52
214 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution campaign, indicated by the presence of numerous embedded links to external PDF files, many of which point to redirector infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=mixed+compound+subject+definition
    • https://cdn.sqhk.co/vijasezadida/sgegf6c/30319985511.pdf
    • https://cdn.sqhk.co/vigesiji/thi7jhb/67809488872.pdf
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/41bbad1.pdf
    • https://cdn.sqhk.co/mujekesire/3QHKifF/arkade_blaster_controller.pdf
    • https://cdn.sqhk.co/gituridewo/gQhjvie/download_game_pro_mx_3_mod.pdf
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/bosezilatexulasofa.pdf
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/fevesulidejupowidapi.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/fuwanepixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3487d139-18b5-4677-a914-cec470c970d0/6037443892.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c754.bin
4637bb72c28de886c3ea912ef0c71dc206a3d99ec8f4bf9ea401c7eff7bd6bbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 5252 bytes
font_01_sfnt_off0000d93c.bin
173585afa059779a1f248292f04a200469a004673bc6e6a3da81f5044d5d47af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 11072 bytes