Malicious PDF — malware analysis report

Static analysis result for SHA-256 2473fcf05a23074d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 15:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6223c1707c0dfd0108ccbc8c757474c7 SHA-1: e80eb87d87109b5241bb7ed22fb0c33e5afa7c89 SHA-256: 2473fcf05a23074d32642903979c4ecf5a6ff015b382e70edaa07da4715f6a87
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of multiple embedded URLs pointing to potentially malicious PDFs on various domains suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings point towards a malicious PDF designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://olboihorgaszto.hu/editor_up2/revukufavadufugonibo.pdf
    • https://bunyaminerdemir.com/resimler/files/64272297949.pdf
    • http://mimarkamilozkartal.com/userfiles/files/tokilidonudopuweje.pdf
    • http://hk888.edo2008.com/com/comimg/file/20210913_140247_121.pdf
    • http://fireprovietnam.net/luutru/files/notufipopesowefove.pdf
    • https://solener.info/ckfinder/userfiles/files/jisilarovofujubemolex.pdf
    • https://harteron.ee/userfiles/file/dedovokefetisokuze.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/33752988499.pdf
    • http://ducthanggroup.com/webroot/img/files/vanowenetipofexuburepabu.pdf
    • http://mgtuae.com/uploads/file/10480865730.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/12902721819.pdf
    • https://abisspaandboutique.com/nbloom/fckuploads/file/xurun.pdf
    • https://ijtm.in/userfiles/file/98776353147.pdf
    • http://canxetaidientu.com/images/file/75833459563.pdf
    • https://rabudiagnostic.com/userfiles/files/kosusopavigenafovimew.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/rifixakinijubumaza.pdf
    • https://manuscripthandler.com/userfiles/file/zodebidunogobibupu.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7ejef775or56dnp0m92e67si33/89419157719.pdf
    • https://endeligmandag.no/e-brev/data/div/99674804066.pdf
    • https://madeirashopping.com/userfiles/file/93640651225.pdf
    • http://riverhouse.at/pcms/content/file/33266686592.pdf
    • http://ashioke.com/images/library/File/xupokuwigep.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6127537fb---buxuvowagazujunemevoz.pdf
    • http://geopraxis.it/userfiles/files/44344770791.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+vs+android+go
    • 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_off0000ec63.bin
cd036e277887f42e23b115a621cbf9c8644d5eaa495f11a40f32773591364007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10196 bytes
font_01_sfnt_off00010321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
font_02_sfnt_off00011b33.bin
926586077033f7d6845c1f32047d6b3b4bb5a04a32c5a5047d2e5d930edbe11b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 17296 bytes

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