Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91ebc9512cb9c3b…

MALICIOUS

PDF

69.8 KB Created: 2021-01-01 13:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 57b5feebce37bcb691b81ff9d8784bfd SHA-1: 2e277bf28e55ad0f29f8dcd7b564ee45ea085c6d SHA-256: b91ebc9512cb9c3b395580eb8ddffe6a02d644bf2269df46b85901d3bef74381
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm pointing to various PDF documents. One prominent external URI, 'https://trafffi.ru/123?utm_term=vonage+business+app+user+guide', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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/123?utm_term=vonage+business+app+user+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fa376dde82d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5fd77b6f342d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421969/normal_5f97d56dd4b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5fd886eb6049b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fb9bd391df75.pdfIn PDF document text
    • https://dawopebasigu.weebly.com/uploads/1/3/4/8/134886486/7103561.pdfIn PDF document text
    • https://keveronusixenub.weebly.com/uploads/1/3/4/8/134852782/b69a075db583f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f908e536eea8.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/regufojalojaza/c-reactive_protein_blood_work.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/melbourne_uni_campus_map.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/murder_mystery_2_new_codes_2020_june.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/aparato_respiratorio_de_las_aves.pdfIn PDF document text
    • https://s3.amazonaws.com/rijedifatufod/geogebra_6.0_manual.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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 5200 bytes
SHA-256: 147bc2ef0fbb98f63e349297d8659e278ad9b070a64cd3c3ede5252c9addcd3b
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 9896 bytes
SHA-256: 806e6489777220f87d8806b88da7dae55f7ca94813f2300e5fefb75e202d9fab

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