Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8d3301072f23b7…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 19:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61972a78e620b8a3b49aa1faa579202 SHA-1: a3a13e7212544e40a73ceee9e56c9856f51f8d41 SHA-256: 3e8d3301072f23b74fa738df750a6b28ee95b8f7d4cc55c174df7f0895f83696
156 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is part of a link farm and hosts external URIs, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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://nipisod.ru/wix?keyword=the+two+income+trap+pdf
    • https://cdn.sqhk.co/bapulofuw/AifgieY/uefa_champions_league_final_2000-_01.pdf
    • https://cdn.sqhk.co/xovatagemi/2JieNaW/31696586917.pdf
    • https://cdn-cms.f-static.net/uploads/4385213/normal_603149caad2e8.pdf
    • http://xagevogewa.medianewsonline.com/gate_syllabus_for_mathematics_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4404750/normal_602941c5e3270.pdf
    • https://cdn.sqhk.co/xuxinugad/igcdjd4/beautiful_wallpapers_for_phone_screen.pdf
    • http://lalabomujulimof.mywebcommunity.org/newifejunepaziwutotoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e1e1cd3-9690-460e-9c2b-241cd270ee68/nagore_rumi_books_free_download.pdf
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_e112caef91df433da9182c776c086a68.pdf?index=true
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_71bf130794ac4b108cc1fc941a4e5ea2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15baaeb8-b3d5-4bd1-87bd-abb01154fd5d/how_to_heat_frozen_baked_ziti.pdf
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_1ce7f873c4e2473e872fdb2c3acf6881.pdf?index=true
    • https://uploads.strikinglycdn.com/files/63958ea3-9583-43c2-a5d5-77d4635dcf79/fundamentals_of_arm_wrestling_table.pdf
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_29611864315041e18e1c81aa4c7d2391.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c154733d-f269-4ffb-b209-095da51dfacb/wapidadufozewedegajexe.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_1ee5974ac3474d12bf8348c83895b9d3.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_b7d9ae4f9052451981501e20575efd16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b54f87e-c251-4999-bc02-a8714b60f495/what_foods_should_gerd_patients_avoid.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_off0001110b.bin
125e17c9d0caeef4f9dd7129ea456e277d9e7dc0953bbd64511db5b242185880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 5224 bytes
font_01_sfnt_off000122bc.bin
79aa452920c5a9ae5fd2e8b9de99e8d08c33854210d03753e854af0117f92dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 11172 bytes

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