Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ffc6aa388bc30c…

MALICIOUS

PDF

86.0 KB Created: 2021-04-24 07:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6320b9b3939e6d14d9e51e9bbcadcc24 SHA-1: 24e276eb4ad44a89e16ebe97ec1b706793aa3abd SHA-256: 51ffc6aa388bc30cae3aae839e65c4fc946f067d3d4f596c79296dcd84126906
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=long+way+down+graphic+novel+summary PDF link annotation
    • http://vnds-v.website/movie_director_simulator_hack_mod_apk6klxd.pdfIn PDF document text
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/lobiki.pdfIn PDF document text
    • https://setekonireza.weebly.com/uploads/1/3/4/1/134131298/fb00d8.pdfIn PDF document text
    • http://natbeach.space/when_should_i_do_morning_pages92w3r.pdfIn PDF document text
    • https://rekakugiraki.weebly.com/uploads/1/3/4/6/134623504/wedit_dajimurojikuga.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/6772292791.pdfIn PDF document text
    • http://sberbank.services/newuwalaxasalewaforokf52fh.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/rotumoz.pdfIn PDF document text
    • https://dovimivezo.weebly.com/uploads/1/3/4/3/134327865/telalulewetir.pdfIn PDF document text
    • http://vuwomozux.iblogger.org/how_to_access_my_cloud_ex2_ultra_files.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://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_b38fddf83e974da3bb9a4963728a09db.pdf?index=trueIn PDF document text
    • http://buzanuziti.myartsonline.com/music_and_movement_activities_for_early_years.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/abrg_des_marchs_financiers_gratuit.pdfIn PDF document text
    • http://bowedaliwerox.rf.gd/amnagement_du_territoire_maroc.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_76f2844759cf4241a29cd9ea40e50bdf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/4598736698.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_1a4159c86b35405d98e48b5abad19bae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/does_canon_g3411_support_airprint.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/lifevudasud.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/libro_de_interpretacion_de_los_sueos_cristianos.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/wenufojoz.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/cheeseburger_slider_nutrition_information.pdfIn PDF document text
    • http://vimotivugepo.epizy.com/pestle_analysis_journal.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_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 5484 bytes
SHA-256: cb4a571de581cef80b6e3c9dc65c4bdd88d03c0701e120f5bc4b90ae70dec5e2
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10964 bytes
SHA-256: 65199c93bf6bec99bd604d7dd325dad6c97e54b6dd283ca3af51945bf34e5939
font_02_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c