Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fae57c2657ffd4…

MALICIOUS

PDF

69.9 KB Created: 2020-11-22 19:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5719970b1fbd202b7401ebc688b363 SHA-1: 78d118d5d4c2d70a0c90b1f5ce44a6d0be19a4eb SHA-256: 05fae57c2657ffd4c61babf337288a0c684c8a105ec5d66513fdf2d349afc6d5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=gta+5+bury+the+hatchet+song
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/7d0eecf488b0455.pdf
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5f98542f53943.pdf
    • https://fukudikewug.weebly.com/uploads/1/3/4/6/134686524/108125.pdf
    • https://vezidinudavad.weebly.com/uploads/1/3/4/4/134481570/ruvaxatugo.pdf
    • https://fazulozuxili.weebly.com/uploads/1/3/4/6/134625369/ca4a4a8b9c53a.pdf
    • https://pebekokinusixi.weebly.com/uploads/1/3/4/5/134506994/dimaro.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_5fb74fef679f1.pdf
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/famunetajuzigero.pdf
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/75f83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/089b2877-3d72-4ced-af97-a663a0ca5a84/tojotonirefu.pdf
    • https://uploads.strikinglycdn.com/files/8bbf6487-3330-4e10-b286-498a58408230/ford_transmission_fluid_fill_tool.pdf
    • https://s3.amazonaws.com/xabalaru/psychology_in_edgar_allan_poes.pdf
    • https://s3.amazonaws.com/xezonijida/85422124033.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2cb.bin
ccf955cce60a8bbee546e9d9914c8210eb62e60e0f78efff8cf3558ae292526f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 5424 bytes
font_01_sfnt_off0000e54a.bin
77082f885ddc408a62f09740b94b83d58a6d454c3fd2e32a32784d0c9af5d0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 11108 bytes

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