Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc7cd36de9af7ce…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 22:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6033893b0c36f81c68e4680da7e421e SHA-1: ed521988f70f20bc15d0c24336bdea832319a90e SHA-256: 7fc7cd36de9af7cea47177a8c93ec4dd46e6d43de626ede9c9c0317eff0e9204
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=5e+deathlock+wight
    • https://jukaninigureze.weebly.com/uploads/1/3/0/7/130738482/fedugufilupugipa.pdf
    • http://fasad-dom.site/575579136261fqor.pdf
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/97306ba9afdc.pdf
    • https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/sajagevadogul.pdf
    • http://blue-tick-central.com/world_map_picture_decork4kej.pdf
    • http://weinmvc.net/2013_jeep_3.6_engine_problemsgioqm.pdf
    • http://cetapp.xyz/sulixabikxmtl.pdf
    • http://workbykoder.xyz/coliform_count_in_waternyod4.pdf
    • https://jubamojeke.weebly.com/uploads/1/3/4/4/134432472/1535517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_ce7efc08ea774ac3ad896e10fd8a039e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78995eef-5b72-4d79-b46b-6aae59e4e450/is_brother_printer_compatible_with_chromebook.pdf
    • https://uploads.strikinglycdn.com/files/ec287c03-0e83-4a47-b95e-9508d177cd79/95306421578.pdf
    • https://uploads.strikinglycdn.com/files/3762630a-56f9-4aa8-8419-5eff9fd2e77c/97098754038.pdf
    • https://uploads.strikinglycdn.com/files/a5356979-e755-4b2e-bd86-f12f75d4bb3a/fonosewulen.pdf
    • https://uploads.strikinglycdn.com/files/e308f577-9270-4fde-8d7a-d567bd6e89a9/xorenexa.pdf
    • https://uploads.strikinglycdn.com/files/02f9c6e0-67b1-47b2-a266-6e1866831f55/judumaxikolewufonuj.pdf
    • https://uploads.strikinglycdn.com/files/0210bca3-804b-490a-8ad0-4ec6b13474b2/has_attack_on_titan_manga_ended.pdf
    • https://uploads.strikinglycdn.com/files/2268b7c8-3393-4159-914c-0f17736dbd18/nabojere.pdf
    • https://uploads.strikinglycdn.com/files/e487c075-872c-45de-a17e-5b562ca5f7f9/88845668434.pdf
    • https://uploads.strikinglycdn.com/files/dd7522b2-bf8c-457d-82db-b8a369f85aea/how_to_program_motorola_ht1250.pdf
    • https://uploads.strikinglycdn.com/files/ce126b39-1500-4cfb-bdc2-198a18eb3c08/11815795292.pdf
    • https://uploads.strikinglycdn.com/files/f89cb4e6-666f-4339-bfaf-ce9a0b2fdb1e/fisher_paykel_dishdrawer_error_codes.pdf
    • https://uploads.strikinglycdn.com/files/140463fc-6d5b-4a21-a02e-ed709958d2d9/xodizarim.pdf
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_b3a0d022909c4daca5aea950fc9f6950.pdf?index=true
    • 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_off0000f09f.bin
c8702172931ef7772048230a6c800b9a661ab76b34a8bd2933f0a3b401032d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 5112 bytes
font_01_sfnt_off00010219.bin
f98710a6ed9b8943074da95327a701499f37efd6f5837526aa79a83e6301ca27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10736 bytes

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