Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e7f18a60c28f30…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 15:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22f04b16bab5433848b698b87bc55042 SHA-1: e7aa00a58cd018b27665bed17289eed4f351b765 SHA-256: f2e7f18a60c28f30e8d706998bf1b5078bb57fb3ca4cad8f86f1b1d2b44ac520
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The primary function seems to be redirecting users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://zanethompson.com/userfiles/file/xedugafopufi.pdf
    • http://pogotowienaukowe.com/Upload/file/57075820523.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/94710468922.pdf
    • http://jj-metals.com/userfiles/file/2021090823333973499.pdf
    • http://dietaltop.com/userfiles/files/68912402987.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/fabemobajurojolobo.pdf
    • http://auxerretv.com/content/public/file/purasorojiwuxozesitaseveg.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecdcdce5e3---52185393641.pdf
    • https://cremyco.com/app/webroot/docs/file/gejipaxatateto.pdf
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fuwabedi.pdf
    • http://gmart-express.com/demo/uploadpic/file/naxalatugoxe.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/10737913448.pdf
    • https://copab.tn/216mag.svn/uploads/files/93479828849.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/71871008956.pdf
    • http://diversecityuk.com/userfiles/file/bijes.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/40377946013.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/wumuvotedet.pdf
    • http://solo-reisen.com/media/images/file/zuwafolerekomi.pdf
    • https://muzpony.de/obrazki/file/14977538667.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bigaxa.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/jebomev.pdf
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/66038963124.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/mapokolimolifusov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cooking+madness+game+online+play+free
    • 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_off0000b59b.bin
d9dd6650bfa260315df9efdadb38837bdcc4189354f459f315af4642684c6b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB59B 18164 bytes
font_01_sfnt_off0000e468.bin
1a6a609cacf297269aecffb0ba02a5497cd409ca43148490a8eda4d4a8b939d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 10980 bytes
font_02_sfnt_off0000fdb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes

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