Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1b57436c3fcc52…

MALICIOUS

PDF

108.6 KB Created: 2021-03-28 23:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 904b60ed167277c29ffb30ba5172afd5 SHA-1: a87d3d313d9af660c17c823bf68a27b4a244809a SHA-256: ff1b57436c3fcc5235b2d9f7b0facbb11eb0f692158870d6ccccf27d909bff3b
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The file contains a large number of external links, suggesting a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate potential for malicious content delivery, possibly via embedded JavaScript.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/wix?keyword=shadow+of+war+trophy+guide+dlc
    • https://cdn-cms.f-static.net/uploads/4449789/normal_6012fdfee250a.pdf
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fdccd1556cc1.pdf
    • http://flebolog24.com/french_verb_conjugation_practice_sentencespuro9.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_601b1f45d290d.pdf
    • http://sobakin.space/bilaspur_railway_station_platform_numberq9hsb.pdf
    • http://razvivatel.blog/8170234292thpdv.pdf
    • https://cdn-cms.f-static.net/uploads/4498348/normal_6047854ce2f61.pdf
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5ffb4a6ab637c.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_600c8bf104bc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_a2a66f4f772d4f839a178730bb9193da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cffcea6c-e317-444b-8035-cae3e23e971e/gagas.pdf
    • https://uploads.strikinglycdn.com/files/91883d92-4667-4bc5-9cb6-53319593ad90/78423549649.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_2bf75f6036eb4f968bded23b36ad8b4d.pdf?index=true
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_82584acac61a4aa4acd22fd7440afbd4.pdf?index=true
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_c9b789070f2d47a1bd7821a46d19791a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/04b721f1-43e2-4d33-920b-867706eced50/bojez.pdf
    • https://uploads.strikinglycdn.com/files/c4f5b7e2-26b0-47a7-abcd-18ee415f45ee/battery_tender_plus_charger_and_maintainer_12v_1.25_amp_powersport_battery_charger_and_maintainer.pdf
    • https://uploads.strikinglycdn.com/files/25041a59-981d-4796-8be7-c7f18653f248/dj_clue_mixtape_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/86d57ae8-21da-4dca-af43-2297301c1081/kali_linux_programs_on_ubuntu.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_off00016b22.bin
0497237daf916d0b27beeb15b1f40339387568120e1b91da0c372f3a8c72bb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B22 5536 bytes
font_01_sfnt_off00017e0e.bin
96c0fa1d8140d0dbd6658edc6f8931dd53591a85ea967aaf8f28fa0e1a17e8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E0E 12140 bytes

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