Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf09e8164accf4f2…

MALICIOUS

PDF

68.6 KB Created: 2020-11-14 19:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: cd558680cff598d1751a4a9b927b656f SHA-1: 5a75146b39274d3e60bceac95d023f8d00c47cb3 SHA-256: bf09e8164accf4f235de548d8155726f2b71bc7d27d5897b56f106fabeacb214
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains numerous external links, including one pointing to 'trafffi.ru', suggesting an attempt to redirect users to potentially malicious sites. The presence of embedded PDF link farms further indicates a tactic to artificially inflate search engine rankings or distribute content through a network of links.

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
  • 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://trafffi.ru/aws?utm_term=the+great+debaters+movie+questions+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415934/normal_5f977ef480d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5f9864dc9b055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fa33cb48c12e.pdfIn PDF document text
    • https://ladeletoleworuw.weebly.com/uploads/1/3/4/7/134712388/botawoseviwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8865bdad61f.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/henghuili-files2/tukuximinupitekeruk.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/654184924.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/financial_and_managerial_accounting_15e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a88d575-4638-47bc-aee9-50004b1575d1/92760491467.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/albuquerque_street_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/87339377335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c88d5da-d7ac-4234-86bf-bda696fa6964/coc_clan_war_league_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/97283790754.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/weatherbeeta_dog_coats_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/isekai_seikishi_monogatari_genre.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_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 5740 bytes
SHA-256: dec1e0cc49f1fb4e0b55052710379c96783e9894b0ce12f904f7b10b4391bfe1
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10756 bytes
SHA-256: f5db28ef0bd185cc353f19f7d75206491ae53cf9df17e863b3597e70c1134556

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