Malicious PDF — malware analysis report

Static analysis result for SHA-256 804fdcb3f1e2124b…

MALICIOUS

PDF

78.3 KB Created: 2020-12-21 15:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b8f3682761697eb3fd3f232b6869762b SHA-1: 9c6ff39cf14d6e81cf5ac02d2a92d97382a02097 SHA-256: 804fdcb3f1e2124b553e6261407796015dd5fb03ec26574bacdee995ea427517
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to 'trafftec.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to pricing and the wkhtmltopdf application, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafftec.ru/strik?utm_term=axolotl+pet+price PDF link annotation
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/92a5619077.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/6025864.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/435368.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/tugetekozes-dotusezad-rusopojiwude-dofal.pdfIn PDF document text
    • https://jezilifubi.weebly.com/uploads/1/3/4/8/134887413/5721622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc553500b6b03258f52b7d8/t/5fc882c4d17d55300fb038f3/1606976198880/babusekugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89babd8-0e20-4bf8-b7e2-b1eb965f25d1/65776779471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fbb256d-13be-497e-b872-9487013c455e/figawiwupap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ae3eea-8f5a-49d9-9b0d-758365c52080/16292345978.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/69659079614.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68db56609fd0ee7b8a05a/t/5fc7e413440ab22dc97b171c/1606935574579/rawufuwopaxepuburapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e52f79-bd90-4aab-9c5d-31a51e23b530/ridinokalariwojiduni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ae0d6d-81aa-4797-9460-72529e6d4f03/mobdro_apk_download_pc_windows_10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 4280 bytes
SHA-256: 813879ae2cf6fc17baaaff79c954511ae8ba858cc0418a72ecfb2b7149c25c79
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10976 bytes
SHA-256: 7e223df9cd0b8c627596b42f0e1a85823d2b4a2ec9b4e33af68a670d3c71d34f
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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