Malicious PDF — malware analysis report

Static analysis result for SHA-256 173b42f949eb2238…

MALICIOUS

PDF

71.3 KB Created: 2021-03-19 22:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2078ecda3c6bebdad704394810461ab4 SHA-1: 676498ca59d0c34281a395f19f7f62c49c186ddf SHA-256: 173b42f949eb223884a2b259d7f0052096477e7d15c461d262bc37d3d0818239
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 dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

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-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=rpg+maker+mv+pdf+tutorial
    • https://cdn.sqhk.co/dujujema/KShkIjd/globe_at_home_prepaid_wifi_review.pdf
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/3159992.pdf
    • https://cdn.sqhk.co/rejoxapuzopa/gfMCjdT/please_update_your_amazon_alexa_app_email.pdf
    • http://fawikenaxalu.scienceontheweb.net/how_to_rig_corn_for_trout_fishing.pdf
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/7ad3c12b912496a.pdf
    • https://cdn.sqhk.co/begokaxawip/bATfsvF/cartoon_channel_list_in_airtel_dth.pdf
    • https://cdn.sqhk.co/xufuwejaxe/dgdPhf9/tevev.pdf
    • https://cdn.sqhk.co/tumozaraf/FTgg18n/spider_stickman_hero_ios.pdf
    • http://suzamajotibe.mywebcommunity.org/indonesia_is_the_largest_economy_in_southeast_asia.pdf
    • http://sevibifodome.getenjoyment.net/how_do_i_program_my_directv_remote_to_my_denon_receiver.pdf
    • https://cdn.sqhk.co/dagosasojo/g15ijjb/horse_racing_manager_games_online_free.pdf
    • http://lilozekakotelup.sportsontheweb.net/35343219015.pdf
    • http://tosefabebiribow.scienceontheweb.net/junupoxedike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xezujuxoz/cetoacidosis_diabetica_tratamiento.pdf
    • https://s3.amazonaws.com/norozovijalu/cooking_terms_crossword_answer_key.pdf
    • https://s3.amazonaws.com/bokofapig/45828114302.pdf
    • https://s3.amazonaws.com/jakujakula/86681141994.pdf
    • https://s3.amazonaws.com/bejokazemur/printable_battle_rope_exercises.pdf
    • https://s3.amazonaws.com/bogijexu/fmea_example_manufacturing.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_off0000da77.bin
811036647824051d5ea604350a013a510aa9222e8a44c5d59f6cbf9d1180d4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 5316 bytes
font_01_sfnt_off0000ec8a.bin
a24b869bf4693f07dd516c2ff8346b05c4d9f86dcf8dce13eeec328dcefc3603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10452 bytes

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