Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0f88d476288b02…

MALICIOUS

PDF

76.4 KB Created: 2021-09-15 13:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11ae375934f8cab9fe209a846c13da05 SHA-1: 0622879b3ded50f20043b3bea8c30a53602b9ff7 SHA-256: 2b0f88d476288b0227efbc7db3d77510e34abd55b7c1a5d03527732efcfd1609
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to redirect users. The presence of a 'download button' heuristic further suggests a lure to download a payload. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=android+id+apk
    • http://karat-dobremiasto.pl/userfiles/file/xabadimiwupuzu.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bd54ed6d---ramuxukazilokibatevu.pdf
    • https://praktijk-fix.nl/userfiles/image/file/32188096449.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f431c122aa---79501377332.pdf
    • https://maftplayer.net/calisma2/files/uploads/58552858272.pdf
    • http://www.mostenpo.jp/userfiles/files/tixanigonawod.pdf
    • https://mimzyonline.com/userfiles/file/pelipodugomorexo.pdf
    • http://hanhthien.net/uploads/file/sudimejekita.pdf
    • http://cuatro-pr.org/sites/default/files/file/29500526525.pdf
    • https://aildf.in/userfiles/file/99578354113.pdf
    • http://ymmicro.com/files/files/zupigowosunilafaj.pdf
    • https://mertlakustika.cz/images/pages/file/lakipovusujipefi.pdf
    • http://pokeocncafe.com/uploads/files/porufupazinuxorevapebux.pdf
    • http://daoltrading.com/userData/board/file/10061885682.pdf
    • http://iphysiology.ru/upload/fevufavunav.pdf
    • http://plnjl.com/userfiles/files/vixep.pdf
    • http://hndgyl.com/v15/Upload/file/202196163463374.pdf
    • http://newkontakt.ru/userfiles/images/file/povamozoximidimiserivir.pdf
    • http://marasintl.com/public/ckfinderuploads/files/fatokawalisuwam.pdf
    • http://tvcsoltau.de/userfiles/file/pitubodukazoxuwobapibuz.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/poxapadojes.pdf
    • https://mediaget.com/userfiles/files/lisesuliw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c964.bin
d012a415e8e9ff88ff38262d46acf9d9be64c267d15e999d9dbf49964d3d75e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 17520 bytes
font_01_sfnt_off0000f645.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
font_02_sfnt_off00010e5c.bin
388dddcade5bcb241304ca0eb20250ecfe6a74464432cd1b884c29551fe37ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 10012 bytes

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