Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a692ea4478741e1…

MALICIOUS

PDF

73.4 KB Created: 2021-01-07 03:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d76c544426b72759c687d9d83215d03b SHA-1: c309b70392258f6ae9b4e82b4059a135fcf46ccd SHA-256: 2a692ea4478741e1681185e54ee1baeab179e7d020a2f77f7a280a3a32ac7734
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, many of which point to external websites. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://traffine.ru/123?utm_term=que+es+la+quimica+organica+y+su+importancia`. The presence of a link farm and the ML classifier's high confidence score suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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
  • 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://traffine.ru/123?utm_term=que+es+la+quimica+organica+y+su+importancia In PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/kulonome.pdfIn PDF document text
    • https://xorizugabe.weebly.com/uploads/1/3/1/3/131398100/raviturukijamajiv.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/jipulabikifi-sesepolekumit-wobuxuro.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/madoboju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5fd10e3897197.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/linotolurotukul-puvokebe-dobobiruv-fosezebevidized.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5fb34207df84f.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/bddc68c0-0d74-4207-9c2e-6bc8a5fde557/tablas_de_senos_y_cosenos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a53e05-a89d-451a-a00d-297fe6360047/55066126962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5e0edd-2ac5-4f38-82a6-f2051d0042a7/93249092555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33b6294-4156-429f-aef4-2c467d1972c2/jeragagofutigusekatori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a51f06-c339-4fea-bb0c-c1d64643bbe9/avengers_endgame_watch_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05d1eb2-8f2f-41bb-9b98-478b0944173d/wajame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9468206-f9e4-4076-aeb2-ad2178cf1eca/wulas.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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 5544 bytes
SHA-256: 9942e60a3cd19da063c162870bb6d76715291f4eff09b251d7c6d6e1584f1b49
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 11604 bytes
SHA-256: 3d7bb9e8f9e88054861bbf8f534c170aeaac681deb4b3e4a7a5d565f840fc170

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