Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb683f7933934322…

MALICIOUS

PDF

77.9 KB Created: 2020-12-27 02:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0f66c31cf64ed790f0f9fee580f08760 SHA-1: d8ee20959440d7e0d0f0a7a13bc8dac7c6493bae SHA-256: cb683f7933934322dac0c278410bd5a5c64b855068dc0c8c66bfb65aee1a82fa
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'traffking.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=dysmenorrhea+treatment+guidelines In PDF document text
    • https://cdn.sqhk.co/duxajoje/ZOqgjpv/codes_super_hero_tycoon_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nugutobudan/uVhb4ij/83448256361.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/gqjjieL/action_coin_blockchain_wallet.pdfIn PDF document text
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/33dcc85277b2a74.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/befarekogol/10960700048.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/intelligent_business_advanced_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/wetep.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/tableau_certification_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/eso_indrik_mount_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2527af6f-d40f-47b0-a25f-7b46ba90a8f6/collier_county_property_deeds.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/76288176927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91a41b5-dff8-435f-9c46-27303df1a081/42903623242.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/closed_early_sign_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0545b6c1-ed96-4ae6-a8a7-df854e7f68a6/69996262969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb02c3b-9d9e-4afe-9467-c1bdd9e2242a/cassandra_the_definitive_guide.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5340 bytes
SHA-256: 6a4e922ace892c6a0145c5c854738e8bea644cc72c35422fb7eb22a703d951da
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10636 bytes
SHA-256: ef2d2f826d6d240a917d91cb0be5d02055bed71595e712e6d3b9ca2fd692c547

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