Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecef1423558fc6e…

MALICIOUS

PDF

68.4 KB Created: 2020-12-26 02:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc195615463d2654d3352ffe1666d20b SHA-1: b46a51f592a7bfe99009271e5471010b31721246 SHA-256: aecef1423558fc6e9e2a7d7dd57b0eb1f7af0225c85a2a3b05d41e0a4015aa63
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'trafffi.ru', is flagged as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=superman+whatever+happened+to+the+man+of+tomorrow+deluxe+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450034/normal_5fbee5c1ce568.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hjahgRO/25318752789.pdfIn PDF document text
    • https://riwominejakubik.weebly.com/uploads/1/3/4/5/134598273/pamoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5fb9e068bdd2f.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/haibPge/42196914787.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/mujazapidezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8dc2c94271e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5fa77df8ec092.pdfIn PDF document text
    • https://cdn.sqhk.co/pusutekexu/he6jdzx/me_walmart_app_not_working.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://lotisawiro.weebly.com/uploads/1/3/4/6/134625457/xuvenadadi_guwax_vunibin_busafisosovet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44f3e9b-a380-4234-aea5-0792b57643ad/wobuzadij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bf7a3a-41d6-48c7-8959-c1475e5e7e3c/debbie_reynolds_singing_greensleeves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085da130-87db-41ba-ab9a-e096541d8950/57831543733.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_off0000cd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 5424 bytes
SHA-256: eeb8d808b2bb8f1f412e89b86cbdddffebe378b21272e41bbc2a1a05a4d1d76b
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 10824 bytes
SHA-256: 636eb81fa3e81b20a99d6647657b1b403c1bf428dcc533b7bcb37b496fe1c81f

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