Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41d098c61fff35b…

MALICIOUS

PDF

84.2 KB Created: 2021-03-22 20:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e224c417db42a8f7f2e4e3668786ed SHA-1: 9745e919b7753442d29272e123ab5fdb72a7e8c4 SHA-256: c41d098c61fff35b1973c8be952675d14c501b09e34aa0efbc6bab8b7ef615f2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's intended to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=microsoft+access+tutorial+video+free
    • https://cdn-cms.f-static.net/uploads/4427793/normal_60251acf05cfe.pdf
    • https://fomimelagesuto.weebly.com/uploads/1/3/1/4/131406840/jelutiguw_ramajara.pdf
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/jerusubalajujuse.pdf
    • https://tajizaruf.weebly.com/uploads/1/3/0/8/130813694/fivakibagul.pdf
    • https://puramekekekiz.weebly.com/uploads/1/3/4/6/134648744/wekabo.pdf
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/kajalafawu.pdf
    • http://optalpha.com/construction_project_inspection_report_template0v1kg.pdf
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/3327512.pdf
    • https://cdn-cms.f-static.net/uploads/4375885/normal_601fd86cee7dd.pdf
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/ad53bd8519a67.pdf
    • http://rarinokuxe.iblogger.org/academische_vaardigheden_voor_interdisciplinaire_studies.pdf
    • https://fevupadijedip.weebly.com/uploads/1/3/1/4/131407665/zilotumar.pdf
    • http://mebets.xyz/fortnite_on_play_store_androidqiafr.pdf
    • http://paxivevazuf.iblogger.org/contract_labour_law_india.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gakowutegufez.rf.gd/how_to_replace_battery_in_citizen_eco_drive_watch.pdf
    • http://megegadimopef.rf.gd/jasugikeladabuxajesofe.pdf
    • http://wagadepepixapu.epizy.com/how_to_set_up_skmei_watch.pdf
    • http://mawovewukebiz.rf.gd/573921763.pdf
    • http://pezazutosoxa.epizy.com/bigo_live_for_pc_filehippo.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_off00010e19.bin
a20aa3044d6621b666602da9c1902a9ae2677f91064834c6fe81b97933d88d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 5080 bytes
font_01_sfnt_off00011f84.bin
5421c85291611ddd9075785e612aa8a3447d29c0fd96123a0858fd6426d8e483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 10540 bytes

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