Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc08ba1ca337a16f…

MALICIOUS

PDF

81.4 KB Created: 2021-04-08 16:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1ff8754b9a1480e60521829bb821571 SHA-1: 956ca6e526055f8c0b3d957e8f9049431d19e3a4 SHA-256: cc08ba1ca337a16f4b830b3cabb0e6d0b2797cfc4a37db65c30e74c8e0d624ed
186 Risk Score

Malware Insights

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

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 0.9998

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=storm+king%2527s+thunder+roll20 PDF link annotation
    • http://rupaduwovuw.getenjoyment.net/jadukajuronagud.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/SMig2jc/black_friday_2020_deals_walmart_ad.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/LhjjirM/fotirakan.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/df9hfgc/mini_hl_speedy_louis_vuitton_price.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/master_of_the_universe_castle_grayskull.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/mixeteli.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/hCqhhhh/ladies_gold_boots_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/vGvibjg/music_with_lyrics_on_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/sgchbgf/vulamafegiguvubiwi.pdfIn PDF document text
    • http://laxavigikax.22web.org/anti_discrimination_act_1977_nsw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_ca3e97f69ec24dcdb2ceb520162facf6.pdf?index=trueIn PDF document text
    • http://jadufabusen.epizy.com/rituxupibobojafutona.pdfIn PDF document text
    • http://fonumelipo.rf.gd/nipobujatopanamawinaj.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/demumovo.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_c9c766acc2e44eab90e98fcc7184c025.pdf?index=trueIn PDF document text
    • http://zotomamomi.rf.gd/22569859689.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_af03a6b5588a4602a308c9ac304d58ff.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_36b8b7598f6c407aaf188bfdca886f3b.pdf?index=trueIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_9bd735d832474cd29dfafcc0c18fcd6d.pdf?index=trueIn 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_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 5504 bytes
SHA-256: a7ae48da18a79c52b3ade81b12832bd183f7bbc5e800a77055d1957d1b1eda4c
font_01_sfnt_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 11872 bytes
SHA-256: a82f559c0f90e9b702e3f43e6f3ae8cd22ecc800a47d7df05a92fabbf0129ec2

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