Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d286df3967b0e7…

MALICIOUS

PDF

79.3 KB Created: 2021-03-06 18:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f9cb5834195e5aae6b755c1367c81606 SHA-1: 332180e6621bb1b494d08443fd9bc47f925848c9 SHA-256: b3d286df3967b0e73c16bde3902bbfd65151565e12359e4ab9a6444f47a025ae
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=starfinder+beginner+box+character+sheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5fc5e59f5bb23.pdfIn PDF document text
    • http://dovulup.iblogger.org/bajrangi_bhaijaan_full_movie_hotstar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_6041fddedae56.pdfIn PDF document text
    • http://chambrehub.xyz/interchange_1_fourth_edition_workbook_resueltoiu2zd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_60375191bf628.pdfIn PDF document text
    • http://jushq.pro/15210370880yoncc.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/w8BgfYD/86691677494.pdfIn PDF document text
    • http://jewlgems.com/dyson_cinetic_big_ball_animal_allergy_vacuum_for_saleg3oha.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/jthckhf/palagaditutobi.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/gNgenmG/web_address_for_canvas_student_guides_hcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fee1fb6f30a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5fc7600bbac5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_5fe82d157ad44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_6001e1e712ecc.pdfIn PDF document text
    • http://supermagazforsale1.xyz/708291236098sxrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6010d05754047.pdfIn PDF document text
    • http://center-about.com/72341117524trai8.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/hbxhbjf/how_long_idle_car_charge_battery.pdfIn PDF document text
    • http://vumoramoguko.22web.org/how_powerful_is_chaos_in_greek_mythology.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/29808596070.pdfIn PDF document text
    • http://lenixad.epizy.com/sasulasebidemojunupuwali.pdfIn PDF document text
    • http://meferujapepaz.epizy.com/how_to_change_the_oil_in_a_champion_4500_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/ampicillin_sulbactam_dosage_form.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5696 bytes
SHA-256: fcf47f34f55798d2ca0ed88bf9f3589964150710275963598c7189c0784903fc
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 11572 bytes
SHA-256: ed8b3c868b0949ee33b3bb5a5537ea377919290c2e2d88b7973350424195c4d8

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