Malicious PDF — malware analysis report

Static analysis result for SHA-256 32459a7b40151c49…

MALICIOUS

PDF

72.2 KB Created: 2020-11-25 01:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a9696111553b6b22942c782c23a0aa62 SHA-1: e6a1faa06fb1e64ae9a9a14ae0381b9aeb04473a SHA-256: 32459a7b40151c493c0e7204fbca01c145badf4e5f883e24159dacd95e430b3f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffi.ru/123?utm_term=abatron+wood+epoxy+instructions', which is likely used for phishing or to redirect to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=abatron+wood+epoxy+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5faea8ef49a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_5fb2e6541464e.pdfIn PDF document text
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/2067259.pdfIn PDF document text
    • https://xiwitewikilimav.weebly.com/uploads/1/3/4/3/134371529/72a7ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5fb2743b7b477.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://uploads.strikinglycdn.com/files/a7edd6bd-f64b-4701-af5c-7a0a85703c08/50524152191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7deea3aa-0a26-45a4-a88f-4914a0eb9b53/80469702685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ccb2af1-2be3-43f5-80a1-2ec41b2c4619/husqvarna_350_chainsaw_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833bcc57-0903-471f-97e0-f9d88d3d8a83/sisidupapuxetekiditu.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/critical_path_method_problems.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_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 5308 bytes
SHA-256: cf64e3fb6c856f2a31eda554ee102b8b84ced45be6049f8298dbc61dff796a32
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 10904 bytes
SHA-256: 3476dada25cbbd5dd43bc9405be9e6c79d5e3ec8d7a74d2d887399409211ca9a
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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