Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb8367da343c043…

MALICIOUS

PDF

59.5 KB Created: 2020-12-10 09:38:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b67f180e5e6361864861d547b10521b3 SHA-1: 76676d279e7b0285798e1c4b6e9560764c429258 SHA-256: bdb8367da343c043db0a71a5e4e20b4b1423c0ce28aa09fb40db6d17f6b56589
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffe.ru', which is likely a malicious domain used to host phishing content or download further payloads. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that the embedded link is the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=uncle+ato+mensuro+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5fc299b823ab3.pdfIn PDF document text
    • https://kisejugizojo.weebly.com/uploads/1/3/4/6/134656745/sobafesix_nokegamosesilo.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/ranurojo.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/c6f4e7.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/e5b486db9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc59b7d2cf09257bd8b9178/t/5fc87686217b3604eddd69b5/1606973062355/space_harrier_2_mame_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/bevamopodaketatawixezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a887a45-3b2b-4765-830e-278ca89fcfa6/aten_uc_232a_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a6beb1-30ea-46dc-a8c0-63861167c3e9/perspectives_on_the_world_christian_movement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070b626d-9f9d-4345-b166-529c9b1d51e0/14735597120.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38b1e9698b02c7f3141e7/t/5fcc34fa1e1a4d7de11c931f/1607218426298/xovipozugoladuporefizuf.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_off0000add3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD3 4936 bytes
SHA-256: aeb6ba49262817c819e4f9a30fa8864c830d640fec8fd126f4cf91034c99751b
font_01_sfnt_off0000be89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE89 10320 bytes
SHA-256: c2e6267c18798607640566eae149c3c516b93c14018f93827d3668bd6b8f0bec

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