Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e1b40dcc125859…

MALICIOUS

PDF

79.7 KB Created: 2021-03-20 19:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2222a5f6170cc9342b1de19f9462e7eb SHA-1: 24e86ba281295cbadb986b35aa39ba63c62bcc1e SHA-256: f4e1b40dcc1258598423ed5fa8519497c278395be308a54b63c2e9bbb3e9833b
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to 'hobo 3 wanted passwords' and is associated with a heuristic indicating a password-protected archive handoff, a technique used to conceal malicious payloads. The presence of numerous embedded URLs, many pointing to disposable or link-farm domains, further supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://crophysi.ru/wix?keyword=hobo+3+wanted+passwords In PDF document text
    • http://xemokajoled.medianewsonline.com/washing_machine_repair_parts.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/sezot.pdfIn PDF document text
    • http://turekawetareju.iblogger.org/how_do_you_record_accrued_interest_income.pdfIn PDF document text
    • http://kiruvoxexuk.iblogger.org/sukonidupe.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/xerisiner.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/how_long_to_study_for_gre_exam.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/7d34db.pdfIn PDF document text
    • http://xopeximitefun.iblogger.org/74966787917.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/how_to_get_evaluated_for_sleep_apnea.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/0ac973b893.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/9705144.pdfIn PDF document text
    • https://jopixumux.weebly.com/uploads/1/3/4/7/134734794/webodizinamekeji.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/call_of_duty_modern_warfare_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/52481412435.pdfIn PDF document text
    • http://xafafogaditeki.rf.gd/29642615442.pdfIn PDF document text
    • http://sadoboxijowem.myartsonline.com/bissell_steam_cleaner_1383.pdfIn PDF document text
    • http://rapudipawuv.epizy.com/air_vessel_in_reciprocating_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139d47c0-e9b2-4c8b-bf8a-4094914a9f5d/fakowiwava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19cb01f4-b130-46db-9be4-059e4eceff2d/nemuvezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ea7792-c2db-4d00-a857-ef63f746030a/94144594447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4097a9-e5b4-4b8f-bd32-2f088607b8e4/husqvarna_lawn_mower_hu775h_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e50da1-6f39-4984-a2b3-173ebb83b10d/63837704105.pdfIn PDF document text
    • http://lotifajabam.epizy.com/how_to_start_music_distribution_company.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 5016 bytes
SHA-256: aa98fecf38594cd1046782969f200c9a429b2153c5aff8cf40f9f6fdceeee067
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10752 bytes
SHA-256: 377951f0a39d105c026bf69a8e0da0f01708f6d4cf4208d39e2897c938720b2c
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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