Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d994577eef4bdfc…

MALICIOUS

PDF

83.0 KB Created: 2021-04-07 06:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161e7c4b096458fa5e625e71279fe8f5 SHA-1: 1423a6170d97ecdd709f3c1b4ec4ea104463d154 SHA-256: 8d994577eef4bdfcc8fc659c81c5e07212796ac7e415d9d0f64a423446a29f71
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable hosting or unknown domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to accounting, likely intended to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/award?keyword=accounting+for+non+accountants+pdf
    • http://gavefunene.22web.org/51076694748.pdf
    • https://temadugebunexi.weebly.com/uploads/1/3/1/8/131871621/safewiwetirivu.pdf
    • https://rubisese.weebly.com/uploads/1/3/4/5/134589844/vowofo-fajaxikodexibo-xofozedafadewa.pdf
    • https://cdn.sqhk.co/medukukekuke/hdjihbG/66723214952.pdf
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/05461a15d645fe7.pdf
    • https://cdn.sqhk.co/fomolunuvufa/haS8lOZ/rf_bandpass_filter_design_calculator.pdf
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdf
    • https://cdn.sqhk.co/jerivudofin/1QgcjhA/defarerifopudonamikibopo.pdf
    • http://zopedefijewe.iblogger.org/zimizisi.pdf
    • http://jesawukimefix.mypressonline.com/bipipobukupumigutewuriro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0f28e106-451d-4862-b8f7-1201a3a43c73/is_mechanical_engineering_in_demand.pdf
    • https://uploads.strikinglycdn.com/files/33aeb820-16a8-473b-8035-99da91b99ce6/como_iniciar_un_taller_de_mecanica_automotriz.pdf
    • http://kokozebe.rf.gd/beige_because_i_miss_you_instrumental.pdf
    • http://rexefobixavater.myartsonline.com/norimifekebepaxug.pdf
    • http://venudupukir.rf.gd/southern_railway_ticket_reservation_form.pdf
    • https://uploads.strikinglycdn.com/files/7f2b6204-3467-4008-af22-aec1643260f6/jugataretarixexixov.pdf
    • http://mipuxezodovepe.rf.gd/amadeus_software_for_windows.pdf
    • http://banitazivi.epizy.com/recover_deleted_text_messages_android_without_root.pdf
    • https://uploads.strikinglycdn.com/files/73550ae8-607e-42ea-989b-6af729487c7f/78233655509.pdf
    • http://fusozevukatamir.atwebpages.com/descriptive_writing_examples_of_a_person.pdf
    • http://janevaxibeju.rf.gd/aplikasi_tor_browser_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f847.bin
bb78b3a88be28f9ec698679e8c44d68f6a43167f3702936b3b03777a01f4cace		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 5044 bytes
font_01_sfnt_off00010972.bin
a7394314909019f711b6558f86077c0daa9b098b9772bfcac1e879c7aa4eb75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 11796 bytes
font_02_sfnt_off000130cc.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 4324 bytes

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