Malicious PDF — malware analysis report

Static analysis result for SHA-256 552f76194f1561bc…

MALICIOUS

PDF

81.0 KB Created: 2021-03-21 12:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4ec2240a8722c81e485ca04442fc4bb6 SHA-1: 96865248707e89c5538955d269192bf787f2deac SHA-256: 552f76194f1561bc6d0d871bbb4967e46131c9760b075177fe2fdadff985fe60
156 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 0.9997

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 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.
  • 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://maypoin.ru/123?utm_term=bluestacks+3++for+pc+pubg PDF link annotation
    • https://cdn.sqhk.co/bizufunido/MZjhrgY/96076375566.pdfIn PDF document text
    • http://vasezasu.22web.org/feedback_form_for_parents_workshop.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/hwShj6m/bamojovutibepepizax.pdfIn PDF document text
    • http://netubekebusis.iblogger.org/aggregatibacter_actinomycetemcomitans_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bjdhSNo/81584492685.pdfIn PDF document text
    • http://bexibuvisez.iblogger.org/sirufitezex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevuzafofetidib.epizy.com/2020945238.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/60913704000.pdfIn PDF document text
    • http://kololujes.rf.gd/bass_guitar_scales_and_modes.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/xodosozatuxi.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_9499f85d5c7b43cf833cab4ad8642aab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/magazovasazesegekonuv.pdfIn PDF document text
    • http://zikefekumir.epizy.com/will_there_be_a_book_on_jacob_and_renesmee.pdfIn PDF document text
    • http://wimoduwogukuruk.rf.gd/tutigogar.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/13159913053.pdfIn PDF document text
    • http://supisaminuwon.rf.gd/washington_state_mens_basketball_coaching_staff.pdfIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_a1ed5f75aecc420b88f75f4ec5cf380a.pdf?index=trueIn PDF document text
    • http://rekadifaleroj.rf.gd/rifedusi.pdfIn PDF document text
    • http://biborufa.epizy.com/tojekufotorugiz.pdfIn PDF document text
    • http://vegigekud.epizy.com/buddhist_boy_names_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/63002795692.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_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 5600 bytes
SHA-256: dcbd166704af3e32da62c006277a8d2437071fdc320f91a0032773d24ad52787
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 11324 bytes
SHA-256: a12c5f8f92ebbfb6325255ac8d9e8fa072bd3c9c0a7a811d4ec742c02f3d09ed

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