Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f187c16875aa5b…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 01:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bb3e301c394183d83f45b56c8ee6528 SHA-1: b0fb03057a42083428728fc568eb71b0c27fcbfd SHA-256: 22f187c16875aa5b77df825ad063bcac80c000756976db78a9bb0434dd60958e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many distinct hosts to obscure the true malicious intent, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://girl0229960192.com/upload/users/files/4334279550.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/xegawotomeguzopozamuxa.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/wutofujivusanumaf.pdf
    • http://ytlcases.com/userfiles/file/16375345936.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/dokilejaxubasipopusofawe.pdf
    • https://alstar.uz/images/shared/file/10864536715.pdf
    • https://atrax.hr/files/81757643243.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea99798c3---30277484960.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/56408763895.pdf
    • http://busankid.com/webfiles/board/file///8216649780.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/gutokegogexuref.pdf
    • http://k-ookuma.com/js/upload/files/fusirunutenuzulofumusu.pdf
    • http://yuemeism.com/uploadfiles/files/27109194500.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/rikubuxovolikadokirupekod.pdf
    • http://montazerangroup.com/uploader/file/fajibi.pdf
    • http://metafelix.it/userfiles/files/nupebupagulawufitemegize.pdf
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/sokuwi.pdf
    • http://ramenhajimetustin.com/uploads/files/4921311376.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/37288298045.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/lopiseso.pdf
    • http://top1np.com/ckfinder/userfiles/files/24218976119.pdf
    • http://linpus.com/app/webroot/userfiles/files/rinir.pdf
    • http://ensky-chemical.com/upload/files/bubekimorimewamabis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=11+android+version
    • 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_off0000aee8.bin
9c19b7d37c3ea7a849502b0b33aaae158596e58b6957c106c9075c24e5c5252e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE8 16684 bytes
font_01_sfnt_off0000d942.bin
eced29dc2c00dc7210f815b5157e670312812354ada8f6a10adc78d69a98fe70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 10120 bytes
font_02_sfnt_off0000effc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes

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