Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0bca3949e2c500…

MALICIOUS

PDF

90.8 KB Created: 2021-06-09 23:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc021ebd85ae726a9015f1817ce80795 SHA-1: cf45bfae9f38e226c4c63b0ac5a7fef3021a8bdf SHA-256: 9d0bca3949e2c5006b619637307cff4a39e3e874af8a3023a59002468294484a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/pbw?utm_term=zap+dragon+th10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601c624a8ccf0.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/fujifutozumum.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/f5363d6765a16.pdfIn PDF document text
    • https://fafixujanubaza.weebly.com/uploads/1/3/4/0/134096145/kesodusatigologog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_5feb5931ac71e.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/ruzaxajawixazaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fe1ccbf70f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_604b26127c966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifevuve.pbworks.com/w/file/fetch/144667131/como_descargar_software_de_osciloscopio_hantek_1008c_en_espaol.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144527898/pentatonix_christmas_sheet_music_free.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144508800/56620461588.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/f/unblocked_games_65.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/pokemon_sun_nds_emulator_download.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/what_is_the_definition_of_retained_earnings_on_a_balance_sheet.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144502389/asi_se_dice_level_2_workbook_answers_3.8.pdfIn PDF document text
    • http://finebov.pbworks.com/f/3731962958.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144514776/what_is_the_working_principle_of_hydraulic_pump.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/f/34130918784.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 5164 bytes
SHA-256: d7447c536975f62825b5f323c8416e5f90237bde737e2b93aa46b5443d84278b
font_01_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 12692 bytes
SHA-256: 85029331aa73ef200cb2fe200d1dda2f94660fc0724e82d2c822c2a937810297
font_02_sfnt_off000148fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FB 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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