Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18d8d9d438a3e59…

MALICIOUS

PDF

85.1 KB Created: 2021-09-22 19:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f66c1781bb8135287602eb6d28e1b1b SHA-1: 58e7d8d44f959613acdb16900f4be7720cdf81a8 SHA-256: c18d8d9d438a3e59d83fd638c0e0c5a65970f363134c0fce6279d63a3b01d9d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://okuninka-biale.pl/userfiles/file/tasixudugikinazidoxos.pdf
    • http://curry-box-deluxe.de/userfiles/file/57597295189.pdf
    • http://pekbdt.com/filespath/files/20210905094919.pdf
    • http://bagiez.com/userfiles/file/15919620007.pdf
    • http://mycoapaisyl.com/webimages/files/64074899515.pdf
    • http://elitsatodorova.com/uploadfiles/file/zalekanapatodubeserujos.pdf
    • https://guptajimarriagebureau.com/userfiles/file/3629923907.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ff90273f2---fozasotidufuxalotur.pdf
    • http://banhangcongnghe.com/upload/FCK/file/zudafesun.pdf
    • http://koreaseowon.com/ckupload/files/55934177895.pdf
    • http://gazetavk.ru/img/file/dujorefakofikefowufo.pdf
    • http://newo.ru/files/files/zavoxovexovoselifejote.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/47183230568.pdf
    • https://ntc-container.com/upload/files/xazubazumom.pdf
    • http://sakuragiramenandsushi.com/uploads/files/85836522799.pdf
    • http://packamate.com/userfiles/zomepala.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149934cc61bc---12019748160.pdf
    • http://tnslib.net/userfiles/files/74467619239.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/76492339117.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/majerosema.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gemowimowon.pdf
    • http://faptvmedia.com/userfiles/file/kuwisozivari.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/bamixiwipuwegusasijezis.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/daror.pdf
    • https://tectrongim.com/uploads/files/mamavimewipub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=asphalt+8+tracks+download
    • 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_off0000e836.bin
a3a338e57cf73bf4a9b25361d2a3ffd786a76c216edf5e57810343f763896603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 10752 bytes
font_01_sfnt_off00010117.bin
59e1db0aa282718f3642b9ef3872b996002e0cee6416303e874c474606793f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 17536 bytes
font_02_sfnt_off00012eb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 16792 bytes

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