Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8993a4c85205bdc…

MALICIOUS

PDF

86.2 KB Created: 2021-03-17 16:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f4b55c8549cb021e18bb82954e6347c1 SHA-1: e2520cf9617b118b4490d4c5ae35acc23ba326bb SHA-256: f8993a4c85205bdc8ff872d94a1f2393d1628fbbefde50b6ce1e096b3652c1d1
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous external URIs, including one pointing to 'kuzutuzo.ru', suggesting it is designed to redirect users to potentially harmful websites. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/123?utm_term=amasis+font+family+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427780/normal_600ab730a9e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6013723b4113a.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/jbghlgh/monster_hunter_world_iceborne_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/tavimuxeju/cibggii/how_to_play_chess_in_sinhala.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/JzhZjgi/best_steven_universe_music_songs_2019.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/computer_motherboard_repair_guide_in.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/litasowajapevod.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/iduljet/winkler_method_lab_report.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/advanced_english_in_use_2_eso.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/rizixagopi.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/sfynrjc/celestial_pearl_danio_tank_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_60262eca6872f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_60404f1d899ad.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://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_bc24f49a832145e1b94c2bd61b894d53.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_5d49ae83ac464e64854a27c0399de3df.pdf?index=trueIn PDF document text
    • http://fikelamizogu.myartsonline.com/wekolokevopevasadeki.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_030fd4ce7c374e5d85a273baa81b9f8f.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_b520ec158453401d86d7ccaa173b82b2.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_a8df632f45d14b4ba8e11f8c7f3dca27.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_ae86ac6da9274160af507c373e901131.pdf?index=trueIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_09f1153fae194da6a04fb2f435b91ddf.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 4792 bytes
SHA-256: 74064c148c551a09c1483d2c9b65b64e159c7a317082bf8fe54acb3515b0a2e5
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 2944 bytes
SHA-256: 0854e157a5ecb2bd8d1c4c056b5899396a4ebdf589cf47b5758c5b3e4d2c306e
font_02_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 11344 bytes
SHA-256: 70fdaa8ac421f6b3b2058e1736fffcb96fba02d8c0ac569c64f410153632db1e
font_03_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16084 bytes
SHA-256: e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee
font_04_sfnt_off00013beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.