Malicious PDF — malware analysis report

Static analysis result for SHA-256 214f5aa4aaf3dd99…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 06:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 873acbf2c61f38ff93a4a7940cfeef8c SHA-1: 7b5b0759eacd1856df697380d2fe9835c7680348 SHA-256: 214f5aa4aaf3dd99b552adb4d316d6177d8a8e9e590f024f0374eeea3bec5f19
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious or disposable domains. The presence of JavaScript suggests an attempt to execute code, likely to download additional payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e19734d6d0---tirafebuzed.pdf
    • http://e-junghan.com/userData/board/file/56513127563.pdf
    • https://adikkeempat.com/contents/files/daxuken.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c571d8be625d0aac4b235e9982280db0/90512129200.pdf
    • http://goodwill.pl/userfiles/file/dopukiletibagiduja.pdf
    • http://vom-ragnaroek.de/uploads/file/65692783748.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/37953671772.pdf
    • http://z500.si/files/14080683683.pdf
    • https://eldorado777.ro/upload/editor/file/78622074785.pdf
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kufeleburaladiwabulero.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/99403137374.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/13274185088.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/dopemesojizi.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/93899515881.pdf
    • http://e-store-sys.com/userfiles/file/pawerisejetol.pdf
    • http://lokalsport.no/userfiles/file/69772703728.pdf
    • http://gmicropilotes.com/uploads/files/91161703993.pdf
    • http://lachambredechos.com/userfiles/file/94583711548.pdf
    • http://chinalabware.es/d/files/xolakafawatip.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xopelejaxifikafixos.pdf
    • https://foundationkuzmanov.com/files/guwimiwasotip.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/wegutirakuxemadipiline.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=me+launcher+apk
    • 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_off0000d812.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16792 bytes
font_01_sfnt_off0000f029.bin
e89b8a9b98869578db4fc4334bb1f7c32e89f49a2b303f445d90c8b5af1ca34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10176 bytes
font_02_sfnt_off000106d5.bin
b5c6601b5bdbdae62f67daacf8f544bf3c0c374e7a4d2f7c50bd0cfc95d8dbc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 17400 bytes

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