Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d62b31331cb3608…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 13:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c83ec7d26e666d62bdef158e37b49af5 SHA-1: 3bc8ed13900a26d5a44f5e8b478cadf86268091b SHA-256: 6d62b31331cb3608ebe2aeb2b9cdd0ed772c7d81c2e0d136be931d0ae76552ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tourister.kr/userfiles/file/92078707396.pdf
    • https://kheops-so.fr/ckfinder/userfiles/files/gopasegosov.pdf
    • http://erimti.com/userfiles/file/ketodulukazudabesiti.pdf
    • http://botosani.ro/img/uploads/file/lulirutumoxilobu.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/zimizalipedametijoga.pdf
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/fukowizukos.pdf
    • http://www.tokyomagic.jp/images/library/File/nevedusuzapiran.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210912234636.pdf
    • https://pomtco.com/technical/files/file/78828144322.pdf
    • http://vivatbacchus.hu/files/file/98761135165.pdf
    • http://eco-building.cz/UserFiles/File/tekefujopawuziv.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/sajos.pdf
    • https://lanjutpt1.com/contents/files/34592951312.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4f70a57a2---lutabavujumidi.pdf
    • http://rlmlaw.com/images/edit_images/file/lavilamokezufasotoxesejun.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/91120078460.pdf
    • http://ogledalata.bg/uploads/pages/files/nudelidururubewujutup.pdf
    • http://1666-3668.com/attach/userfiles/file/78597024850.pdf
    • http://fs-select.com/images/blog/file/jurezubaxalemigidew.pdf
    • http://hkbroadwin.com/userfiles/97647133114.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8584e49---gexusafotuzaliwon.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210922_141525.pdf
    • http://tetobox-budapest.hu/uploads/files/kamewilematewovexox.pdf
    • http://cornucopiafrederick.com/uploads/files/29220392882.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=king%27s+throne+game+of+lust+apk
    • http://s250801404.onlinehome.fr/img/uploaded/file/jolenesugulobemanuw.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_off0000b54e.bin
7bdd31255892cffdf3c732a12891747cf67c4743b5537f1d4e80fb0e26003227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 11024 bytes
font_01_sfnt_off0000cec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC1 16792 bytes
font_02_sfnt_off0000e6d3.bin
1cacf6fb4240b583fe620c567f047d294f4708e04e166717900498b5dc37b448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16768 bytes

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