Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff8f9499d1149b6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 12:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fde567aa25ed86f152261e787c81a5e6 SHA-1: 1105b8343fc1c572dcf4f11d5961936d20e165de SHA-256: 7ff8f9499d1149b632774f5d694e37c07585340af40e09f8c7768e5d12d940bd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://archism.ru/uplcv?utm_term=android+bluetooth+device+priority PDF link annotation
    • http://precisao.org/files/files/relixinedagewiz.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/1946454839.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/14054397600.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/44868607215.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/47563311951.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/11822925912.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/25771812159.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/88691239270.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/nuposigigugusilafudiworaj.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/wusopexud.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jijutenuni.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/nasez.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/11143691121.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/3716189607.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8317ef1f---58323969789.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/dovizafonaxopoxomuxa.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/3203536770.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/76453760963.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sebufobibebibofubekasi.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/11860801274.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/jazotarujenaxojitanex.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/34485524471.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_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 18200 bytes
SHA-256: c9573bde0a33d61c75d157917bfdba382369f32ad22b80f6c5a8276ce52ea96d
font_02_sfnt_off0001316c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316C 10684 bytes
SHA-256: 79b51d1b3bcf12c88d50ae9d2d204e38f4ba7f213ab93e9d24c6eafe19704f6c