Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c6a8510e5a7b2b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 04:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7abc81644860d00c821f6801c4c010c8 SHA-1: 0b3a703758769dc8cfe0d694b93047f7cfc2f035 SHA-256: 34c6a8510e5a7b2b06031ddc50ae859583863545f5e0a9da8f99c290c74de01f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging a client-side exploit or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=lark+player+apk+download PDF link annotation
    • http://spellenindex.nl/images/uploads/53172336985.pdfIn PDF document text
    • http://bndweb.nl/upload/files/38397996764.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/basonizej.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/17525220138.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/43666377830.pdfIn PDF document text
    • http://tdbm.vn/upload/files/jivujizulularejo.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/14357140930.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zetuwuta.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/gewovesi.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/30624755117.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/viforolomamuguperapeban.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/51323242428.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f76ed311---69771368986.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/fudiso.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/13274809497.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/9178185622.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/muxurojesovekipo.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/81125190396.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/39413312834.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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 10276 bytes
SHA-256: 6c37fbac0993809ed3015fa7e4508dee741fa61586ee500468d5a2f5912ed758
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 18188 bytes
SHA-256: 35a04a9323364735b5ba096a2d86bf2deedb01526740bc89627f4dec9c90d8ad
font_02_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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