Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6419c1b14ad294…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 16:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31673c9f03c51ee6711a41931d87cf7d SHA-1: f4ebe504dfaf57aee494ef81d13b9c5ef314823f SHA-256: ef6419c1b14ad2946f8438b350a89b9845a9336ec94eadcca2b181620ab994ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=india+australia+live+online PDF link annotation
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86825898752.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/55351798295.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xezuziv.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/pegarijiwebafedelenopu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/70699978365.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dajabegigugimazotapu.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zokonoropofekumidi.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/goniluxiwelubagijipoba.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/xuzozijivutapuzugasiru.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/88896302414.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/80902156892.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/jusubulexesamuse.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e022948f74---49934321957.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b65ad3751---majajuvujovelepifid.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/pufakonujisogosat.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/xenetabuxowakem.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/rapexenanatajiw.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/67692532219.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/11643896824.pdfIn PDF document text
    • http://mega.kz/media/upload/files/82749834771.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/jasuzuzaku.pdfIn PDF document text
    • http://ge-mak.com/files/lanamafefotej.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_off0000cbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 17348 bytes
SHA-256: 3f0433b92339409ac1332852d9db125078ec4389163e06a268093a92cc7ecc24
font_02_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 10356 bytes
SHA-256: 073284fc87b79dd047fe809d0c90e7eca3129d98ac5c4f4f2b3f63e6838ec74b

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