Malicious PDF — malware analysis report

Static analysis result for SHA-256 8898e5ebb4547b84…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 00:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37057be5c318d954f1bf5f96bc9282f1 SHA-1: 388a861e8fbbb3f3e789ff5a3c92e37111dc08d7 SHA-256: 8898e5ebb4547b846fc51819d6e95d861a04fd4e643724f46d17996b7c8e7dc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm and potentially malicious by ML classifiers and ClamAV. The presence of external URIs and the link farm characteristic suggest the document's primary purpose is to redirect users to external sites, which is a common tactic for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://aarushimukhwas.idealviews.com/userfiles/files/kobamuponi.pdf
    • http://mixmarketing.vn/upload/fck/file/kawupojazuzaj.pdf
    • http://www.petersonassoc.com/emailimages/file/sefolitunedotaxunivemov.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/51557611438.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/lifejoseta.pdf
    • http://grawerlik.pl/userfiles/file/19804226614.pdf
    • http://dellalontra.it/userfiles/files/talesojitidosop.pdf
    • http://acecaalcoy.com/userfiles/file/6817605488.pdf
    • https://apsco.ly/userfiles/files/jobokomijezugipax.pdf
    • http://hifitness.hu/userfiles/file/videjaroxewaki.pdf
    • http://perles-del-beya.com/userfiles/file/41485367070.pdf
    • http://tinhdauvietnam.vn/upload/files/voxafogemetiwefurepaniwab.pdf
    • http://gowowdeli.com/uploads/files/donevafuwo.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b1b28e3982f76a011033854e0d864628/32605408325.pdf
    • http://rc-saty.cz/gais/image/file/94287747160.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/59aa659bbdc177e60b765f312632eb6d/bepusiriraxutedif.pdf
    • https://miltonmattox.com/userfiles/file/lemowa.pdf
    • http://stroisvias.ru/userfiles/file/fujejisajupudisalijev.pdf
    • https://aneri12.eu/res/file/27382871419.pdf
    • http://shortguycentral.com/ck_uploads/files/xigiwitofovapovi.pdf
    • http://zamdq.com/filespath/files/20210903131750.pdf
    • https://detectiveoffice.net/userfiles/file/6207443393.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=puffin+browser+chromebook
    • 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_off0000db5a.bin
739d9dfdc8f359ba27422b31ed23691d3e5741879e9ceac47f7beada46511879		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10712 bytes
font_01_sfnt_off0000f3d0.bin
da462705c700cbf195332b7abfafac6f555966a5d6bb481fa729534e38602365		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 20400 bytes
font_02_sfnt_off00012952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 16792 bytes

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