Malicious PDF — malware analysis report

Static analysis result for SHA-256 377e361143c9f769…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 06:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63637cdf3e34c6ebee134df988c4eaec SHA-1: e98d12f816c6c546ab427d71ec520c9b57ab3727 SHA-256: 377e361143c9f7699098bf930f9a3d7cc9105a2159db0c69d5bfc77353b4b890
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the ultimate destination. The PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://jenan.com/ckfinder/userfiles/files/gukikebuxir.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/68912027281.pdf
    • https://pmeds.us/userfiles/file/70759477411.pdf
    • https://maintogelonline.bet/contents/files/88213875346.pdf
    • http://joy05.com/_UploadFile/Images/file/nefafatifori.pdf
    • http://queenart.kr/userData/board/file/zufene.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210909_9A73D9E0F530FFD2.pdf
    • http://eqletstalk.com/uploads/files/202109140150521997.pdf
    • http://www.thaitofu.com/image/upload/File/bogisedipatox.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/zavetumogumez.pdf
    • http://mwbright.com/upload_fck/file/2021-9-17/20210917055259344319.pdf
    • http://moretonassets.net/userfiles/sunijuxekavozetebufisu.pdf
    • https://cmottaviproductive.it/uploads/file/finifepulefetofinobam.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/94732916872.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/xodozif.pdf
    • http://aquatherm-graz.at/files/wuvaxejugejaribokijogos.pdf
    • https://impulsa.mantareys.net/uploads/plantillas/files/lizewekefu.pdf
    • http://syntrend.critical.tw/upload/files/65604415109.pdf
    • http://www.celso.org/download/lumapo.pdf
    • http://snailgame.ru/upload/files/20210906140158.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361068824bb---duvamameziv.pdf
    • http://portableandcool.com/files/files/nalarizibebapovela.pdf
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/rurajemalonub.pdf
    • http://hk-bbc.com/upload/file/42137391223.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/70012719744.pdf
    • http://yalcinsezer.com/upload/ckfinder/files/kazuxixifavasas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=smart+view+on+firestick
    • 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_off0000f12d.bin
87f27663b189b5fe7ec7f6df980a10282237a5bd006e767e9414b5df5b247b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 18180 bytes
font_01_sfnt_off0001207f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
font_02_sfnt_off00013896.bin
a81b3bac5942ee1df664d9a09f31655a8327e5c1942aaf112e8d77cb7b12d04e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 10768 bytes

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