Malicious PDF — malware analysis report

Static analysis result for SHA-256 502b418c724beced…

MALICIOUS

PDF

78.6 KB Created: 2021-04-06 11:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1905acc4c3e45297994962420892b04 SHA-1: 436d412a3f956fc75e8cdf200b489f26045320a2 SHA-256: 502b418c724beced5727195023e05c2d82829673949960921eae880c5990e6da
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 are SEO-optimized and point to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=eduardo+galeano+poemas+pdf, which is likely used to host phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://mezovuduw.ru/award?keyword=eduardo+galeano+poemas+pdf
    • https://cdn.sqhk.co/tazarufavixa/8jirhcj/jomuji.pdf
    • https://cdn.sqhk.co/dijabidasu/ajh5Nii/pick_me_up_game_on_lagged.pdf
    • https://konupalak.weebly.com/uploads/1/3/5/3/135315701/jalugiwo.pdf
    • https://cdn.sqhk.co/vasegodesazu/gejg0MK/81240894973.pdf
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/dirisakaginulozi.pdf
    • http://fovagenifozemub.iblogger.org/character_development_essay.pdf
    • https://fufifodex.weebly.com/uploads/1/3/2/8/132814348/ccf3ca588fb7cce.pdf
    • http://dutipajito.22web.org/61392154436.pdf
    • https://cdn.sqhk.co/libobivole/hBmo0Dd/39983811394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f25af6e9-086e-44e5-9df1-2ce7a5207c5e/as_a_man_thinketh_book_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/b5427af6-918c-4e65-add4-8266e22a965c/how_to_reset_lenovo_t420_laptop.pdf
    • http://fubixedogiji.epizy.com/89985630941.pdf
    • http://vokutenux.epizy.com/vubid.pdf
    • https://uploads.strikinglycdn.com/files/ead40286-f0c9-4f3f-a9a2-3dc1d127f643/datamax_dmx-i-4208_printhead.pdf
    • https://uploads.strikinglycdn.com/files/6cba5a37-7de3-41b9-8c53-a3b8cb7e4de8/jonupilasevut.pdf
    • http://wubazinosimisod.rf.gd/snow_white_with_the_red_hair_season_1_episode_13_vimeo.pdf
    • https://uploads.strikinglycdn.com/files/870ac9bf-6dae-473b-a93f-3d7c8fd75d15/49006832657.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_off0000f22e.bin
7a171f8a5732914327d127772fa097a1cf523bf1b16f6d9dd6c07f7878e170be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 5316 bytes
font_01_sfnt_off00010433.bin
5105f656f7c9e2e13016ceba9b65aa70f81162c518fff931814af81cafdd2403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 12436 bytes

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