Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc3facfde81a7e1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 15:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 172ee68841968512ef989b25c2f6b628 SHA-1: 9c2941f6703e7ace6cbc0c5b2335e9c8a2e9779e SHA-256: cdc3facfde81a7e110d18a24c68b5993879aca9442e713cba930d73cbaacea46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting, strongly suggests a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to a tactic of creating a large number of links to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=nethunter+android+apk PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9301cd973---71367010676.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/18077417289.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/94522800691.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/diruk.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/7709100886.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/xalotibarikekepubuteg.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/29279687496.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/lujutitomega.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/makupunadudumegimifete.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/jinagumuberi.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/47481234023.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/titefudukexezar.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/vokukudenajo.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/33729489569.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/vibeliposujirajesulodolen.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/luxisilexigevo.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/lopikapapi.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/30769327432.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/nobunerafusuresoxop.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/jodidurubenagejupog.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/digasurivifulosik.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://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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10444 bytes
SHA-256: d9af9315ecbf422e49c6a3acaa8a406fcc056ec5f42f4bf15ca10fec03d5300d
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 18336 bytes
SHA-256: a48fa7ac448fa8d8ca541247c889a0fb1550491751a35b505ec0ce19910b582e

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