Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c15771b68554eb8…

MALICIOUS

PDF

95.8 KB Created: 2021-03-17 19:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34fc241aecad7e172b7888697e1cc587 SHA-1: b44af1021b08c16e01a6295c6c65b11a68aa3f3f SHA-256: 1c15771b68554eb8e4837fb7e10d7ebd9c31c25671d160a8352a1c98d0793d54
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan distribution. It contains a large number of external links, including one pointing to 'leonvi.ru', suggesting a link farm or redirection mechanism to host malicious content. The presence of a "download button" heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=burger+king+menu+cape+town+pdf
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/tovabuwix_nununejunozara_sogap_lizukireda.pdf
    • http://meletemobu.iblogger.org/basic_computer_exercises_for_beginners.pdf
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/kotixiniteneneg.pdf
    • http://koruzerukin.iblogger.org/guduwerupowodinijovamuwir.pdf
    • http://ditumen.22web.org/what_is_pr_definition.pdf
    • http://vunekopewode.22web.org/attitude_and_values_in_organisational_behaviour.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sujomux.rf.gd/85097506683.pdf
    • https://uploads.strikinglycdn.com/files/b1654119-6662-474c-8a08-ccfdfa7e1c80/88684229783.pdf
    • https://uploads.strikinglycdn.com/files/4a93aa9f-7e6e-49c1-88a4-be20ee39c466/hamlet_shakespeare_act_5_summary.pdf
    • https://uploads.strikinglycdn.com/files/9d41e97b-87b4-4fbd-ad09-941605160c60/tribal_leadership_by_dave_logan.pdf
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_0e7adb581bb047448dd8b19ff8476558.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d80cd6ee-b559-4fba-a4d6-2fc445cdc793/baofeng_uv-5r_extended_battery.pdf
    • https://506b1e36-fde4-4d44-8f84-dd746f9ef7cb.filesusr.com/ugd/e2f197_9ee154144e6e428a913e88f181acca4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/89bfd86a-0298-41a5-a00d-63868d2758b8/warrior_cats_film_trailer_deutsch.pdf
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_7372391836634c039cc984428069c6c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d81b727-d04c-4169-9424-282a18c289fa/why_does_my_summer_baby_monitor_beep.pdf
    • https://uploads.strikinglycdn.com/files/555d82ff-67cf-493b-bc35-e5484f7c6d37/how_to_reset_ranger_american_security_system.pdf
    • http://jikudifotiwobij.epizy.com/wsjt-x_2.4_download.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_f83c64dca58945a8a469cae5f126b8c1.pdf?index=true
    • http://zupukafejobe.rf.gd/corbettmaths_simultaneous_equations_linear_and_nonlinear_answers.pdf
    • http://jizonizop.rf.gd/south_movie_2019_mp4_hd.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_6ed541c2a70f4ca9a1091f197aff7993.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a63287f-8013-48df-a0ed-cef1ecec659f/how_to_lay_swiftlock_laminate_flooring.pdf
    • http://pelatutokutemi.epizy.com/81313921870.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cad.bin
4b749d232b803ddad2e943548ecb2f131a429b7e3fd8ac546a59cf5427f38119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 5472 bytes
font_01_sfnt_off00012f52.bin
7fcd79c340f1c3c7489b1d5f954aeadeaa74e39b3576bcc2262ccae079906d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F52 12796 bytes
font_02_sfnt_off000159e2.bin
83b0f3ed90e545d6d36d14a1982d3fe7024877db6cf476e622725167f7eecf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159E2 16204 bytes

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