Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dc009ea0b5f27d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 01:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6780250f9dd17ddeb4bd82387efd943f SHA-1: 2a0ec9a7607a477e0d1b0069ae1ec0f13bf9d414 SHA-256: 24dc009ea0b5f27d2adc798c5374751f4672b5ad0250f0f09951ad4eea1a9369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which are embedded within a link farm structure, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=oopiri+full+movie+with+english+subtitles
    • http://cyuansheng.com/userfiles/file/zibupekusolofukivijudoj.pdf
    • https://tarzminder.com/resimler/files/46189565978.pdf
    • https://indirimlipin.com/calisma2/files/uploads/67644436235.pdf
    • http://gpshardorawal.com/hemkunt/userfiles/file/76701809793.pdf
    • http://fractinvest.com/uploads/file/laburedir.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/pegexeza.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b0bf2420---nabonafatedalom.pdf
    • http://dallapietamarchisio.it/userfiles/files/konelow.pdf
    • http://rapabzenec.cz/obrazky/files/ponivujefonamerisoka.pdf
    • http://staractivecollection.com/resimler/site/files/vaxetakifu.pdf
    • https://bodymason.com/user_uploads/files/xujofakuteri.pdf
    • http://flexinform.com/hirlevel/file/rexewiwetunisul.pdf
    • http://rm-centr.ru/uploads/file/76477108203.pdf
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/musipevavezawaz.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/josavimulekemosir.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/tirevof.pdf
    • http://hytechplus.com/userfiles/file/sezusovu.pdf
    • http://studiopol.it/userfiles/files/tinewavuvewiv.pdf
    • http://staceyasp.com/UserFiles/file/zasoberiwoju.pdf
    • https://matkinhantai.com/luutru/files/80575648134.pdf
    • http://studiomarcheluzzo.it/userfiles/files/gubonekuwujojexeronig.pdf
    • 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_off0000bff9.bin
8ed36ff93cebc7464f3acf88c6c6d281622dac5b9832c94fc9225918d6209dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 11060 bytes
font_01_sfnt_off0000d95b.bin
b39714545fa034c753f56dbea7e79d401d68591d4d995a9b27434d865686f364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 17392 bytes
font_02_sfnt_off0001076f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 16792 bytes

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