Malicious PDF — malware analysis report

Static analysis result for SHA-256 f236d9b58c1fdb9b…

MALICIOUS

PDF

98.8 KB Created: 2021-05-16 05:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ac2b7c548346973840e3b9c77f8e65e7 SHA-1: 287ce26bf713d6b2d1001b56990cd0bf841f657d SHA-256: f236d9b58c1fdb9b294c06297f9d9e51fe9df1065d9d40a54da5c6633c49c76a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a significant number of external links, many pointing to disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The presence of numerous external URIs and a link farm heuristic strongly suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=manual+da+mesa+de+som+yamaha+mg20xu PDF link annotation
    • http://purubifo.medianewsonline.com/19696760995.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/Bzqhbib/38179371805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_6068040536093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5fc92508b519c.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/thj6PRx/toy_story_basketball_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/ngghhqW/14368885847.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/goxalasiwurasirupitadi.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/4a51906b-f555-44de-84eb-7110901cd051/remington_20_chainsaw_clutch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a545747-6f12-4481-a0b1-338eea231c21/mechanical_design_companies_in_pune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37cd10c-f9fa-43ef-a0fd-c234bacfdc0a/how_to_do_quick_calculations.pdfIn PDF document text
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_db4cead4db474d2b99c8cab73b3d7f67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7c4399-66ff-4e30-ab0e-935254582c23/26368335631.pdfIn PDF document text
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_3e120406b46e4cf9b875122dc7ae901c.pdf?index=trueIn PDF document text
    • http://somasetowijo.myartsonline.com/administrative_law_notes_llb.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_1ee1f4ead9e84f0ea23876340885ff40.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 5044 bytes
SHA-256: ae13ff82c0ab99a66ab8d8eaf773b304fa3450f8c48c426a08ee7f9dee09a3cf
font_01_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 5348 bytes
SHA-256: 404c20852db4266f8df122b577511c7ac5d556a7fd2f86bdee0af5f0166413c1
font_02_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 17276 bytes
SHA-256: f8e4ee3888f44c4ca6c1f077c0c8868063260df34337dd3ca170ef3fd0fcce93
font_03_sfnt_off00016d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D57 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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