Malicious PDF — malware analysis report

Static analysis result for SHA-256 d806f9165a2123f8…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 01:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36fcffa25ff25bc9eca6500904a8a68c SHA-1: 10c7ac113210ceb802fae7300b7233888efc0b60 SHA-256: d806f9165a2123f85fcb6dc6cd5fb7798a2658348ea755cc51fb0df3d1c50a0c
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the URLs suggests the PDF is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=logo+quiz+answers+level+2 PDF link annotation
    • https://studioconcept-stand.com/fck_userfiles/file/mujipelavi.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/87748140073.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/nilodarik.pdfIn PDF document text
    • https://aayams.com/userfiles/file/68859269146.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/85530843398.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/61371449681.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/28636950053.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/jebuwezomujixomakejokofe.pdfIn PDF document text
    • https://renault-service.com/userfiles/sixaboserax.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/73947863787.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/74067548838.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/rifobalamefaxojaduf.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/bujiz.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/be0af84b10bcd3933d620178bd557158/boxirolaximivuvo.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14388929120.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pesolemezizetikazok.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59db79e3f---jivabakuboxasotudi.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/2937606834.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29305916553.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/savaxuwexitutubudikatu.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/89184114318.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/81436886685.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/xasujiwafupipafavef.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/rinupokamadivemotebutosag.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/62998382631.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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 18776 bytes
SHA-256: daf90760cafcfbcc68b7bc5210249d0bf89c8ff28f9b090a60953c1d4d4e122b
font_01_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 10720 bytes
SHA-256: 086252e0e48456d50fe7abd2ab2248e8d19c1b40d2642e196bb23bbfab64ee5e
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1