Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4a774599787062…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 00:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bbe300488fd32629927f393279bd5b7 SHA-1: 041035e34e835c4f9577d3526f6bb273ec7e8a11 SHA-256: 8f4a774599787062a5e55ce763a1a2afe850586752deb3bdbedcd1aaca1eced3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the presence of numerous external URIs indicates a likely attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=note+screen+size PDF link annotation
    • https://escolaalfa.com/userfiles/file/nutarivagaza.pdfIn PDF document text
    • http://lagrupacio.cat/file/femizaxawerejezafasoda.pdfIn PDF document text
    • http://myesen.life/userfiles/file/nesuzezeba.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/pigudepurapon.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/jekuwavepefofametuduju.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109021752204311.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/29878949621.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/64828209597.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pilit.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/64506885537.pdfIn PDF document text
    • https://jobtiara.com/files/files/19469168831.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/guwasap.pdfIn PDF document text
    • https://thietbigas.net/media/files/34734804190.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b695bad7bf---28176486557.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/wafotakifuni.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/relugavobuli.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/nabuwogukewagedawawut.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/60584078207.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/73073287612.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/41792592879.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613223ed12264---fofazamamitojidarat.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/kivede.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kejot.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/63033187169.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 10052 bytes
SHA-256: c5eb84ae1181bb6742b7cd4ba62cb860ee40069bc6a3f1f4eb86fa382aabe359
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 18280 bytes
SHA-256: 50c634977a030b3f1096c0b57c92863545e3e2148c4de03d6757c8041aa6fe00

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