Malicious PDF — malware analysis report

Static analysis result for SHA-256 df520112d21b60a6…

MALICIOUS

PDF

71.5 KB Created: 2021-06-03 13:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5acec7f326b2971a109b89aedcad4b SHA-1: a0fcb25649b11789453bdceb5576d643c4f4c1e0 SHA-256: df520112d21b60a6c37a0a8c05b54e0c52c9ebbe962465d1da7f06ab8991c18e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL points to a domain that appears to be part of a link farm, likely serving as a lure or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=what+to+write+in+a+certificate+of+appreciation
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fd091b9ce6bf.pdf
    • https://static.s123-cdn-static.com/uploads/4450257/normal_5ffa5f6bca7d0.pdf
    • https://static.s123-cdn-static.com/uploads/4477921/normal_5ff4a6a59b870.pdf
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/61331bb.pdf
    • https://cdn-cms.f-static.net/uploads/4407724/normal_6032e58be88f3.pdf
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/4c34d4273.pdf
    • https://cdn-cms.f-static.net/uploads/4421781/normal_5fdb98a232bb6.pdf
    • https://mapusuxila.weebly.com/uploads/1/3/7/5/137502154/kupofubajawo-figukefomot.pdf
    • https://nefipuximejax.weebly.com/uploads/1/3/2/6/132696351/kigoxos.pdf
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fcccf2c941ec.pdf
    • https://solorebigaz.weebly.com/uploads/1/3/4/7/134707119/midadiwegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d7e31d0-6785-4edc-ac15-eb98031a8518/nidurunukiz.pdf
    • https://uploads.strikinglycdn.com/files/81a2f4b7-4a5b-4177-a7d4-511bc9f29401/epson_gt-s50_review.pdf
    • https://uploads.strikinglycdn.com/files/0dd085c8-6ee2-4b9c-9267-04a8cff000b3/18007503643.pdf
    • http://visetululiv.pbworks.com/f/operations_management_sustainability_and_supply_chain_management.pdf
    • http://tujelupirobe.pbworks.com/w/file/fetch/144494319/administracion_general_e_industrial_henry_fayol.pdf
    • https://uploads.strikinglycdn.com/files/4fc30bee-7a04-420b-9429-6774bd81745d/how_to_use_a_paint_mix_cup.pdf
    • http://pobonagul.pbworks.com/f/gym_workout_routine_with_pictures.pdf
    • https://uploads.strikinglycdn.com/files/572feac7-1dc0-4564-972a-b3b178642e13/goxon.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_off0000dbff.bin
ed7e64a5198bfa0fe556e0edee0e1d660113eee7613fb1dc063c59be1dcde66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 4996 bytes
font_01_sfnt_off0000ed1a.bin
51e3323bb0a2a4068ca7acb2377052a1cbf8281cb1d97babb26efd42ad21679a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10236 bytes

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