Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d74fb64aede3362…

MALICIOUS

PDF

87.8 KB Created: 2021-04-12 08:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4f824246f0341da7eb90498fcda9606a SHA-1: dce0e5961a26ae521461ce2862c1fd1de4f5cd90 SHA-256: 3d74fb64aede3362a5da9a3905a6903b11d9a2d38af2bcb9f56685f57f217787
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious domains and one specifically linked to a 'survival food supply list' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination through a network of disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=survival+food+supply+list PDF link annotation
    • http://blacklaser.ru/44889322447cqhmz.pdfIn PDF document text
    • http://selectgetc.top/stickman_epic_race_3djtxfj.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/ibGibhi/chex_quest_3_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/cL8hehg/mini_radio_player_windows_7.pdfIn PDF document text
    • http://bilkaita.space/782314730823t9ts.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/pggjjuS/space_force_logo_meme.pdfIn PDF document text
    • http://rcasino.info/hp_elitebook_8560w_original_batterydnx62.pdfIn PDF document text
    • http://kinoxca.xyz/884368029848n14w.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/TCyjcii/nesowatatorep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusixa/31473897347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b770d65-317f-4c7c-8f48-b65df449f3e6/secret_language_of_birthdays_january_11.pdfIn PDF document text
    • http://xujiwusa.epizy.com/transport_business_proposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e9f407-1bd9-4bb9-9e69-e455b67cab7c/25442423319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3a20d6-5ad3-4f35-a910-0676c7b0acd0/93852912159.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/kuwojekaxujowizetudepafav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae149ca-b863-4902-aabe-7f7201ce0e73/kanizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b5c534-f977-4e87-909d-ef98a4eaec75/nirefoxedewiredibininoge.pdfIn PDF document text
    • http://sefogozi.epizy.com/jevonevemidikive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c1327c-e285-472a-a318-4233ad994ecb/commodore_64_emulator_pc_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c66b875-c5a7-4747-9526-ae6a0e4d51f1/29263762158.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 5300 bytes
SHA-256: f83586034399d4921afd4e27e748d3bb345c5e32841056539538f6af9e0e0b50
font_01_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 11484 bytes
SHA-256: fc216528f049a60c2c7da767c12f2923203b6944e92c29ca097df6b9a9c24f92

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