Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83d7dea22ae99a3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 13:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d3fea6edf4de6ab0a41aaa47eee37f6 SHA-1: 02e7a37babb35cb62e22c9f7f470dd6624e95dec SHA-256: f83d7dea22ae99a3d71bbf1c4e62d8fd37434d9b3ed3f74170bce8f1eca1092e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing campaigns or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://belloverde.net/emailer/file/rabejimesigukux.pdf
    • http://szakkepzosiklos.hu/upload/file/sisisuzav.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf13d9c4a---bosobulovivo.pdf
    • http://crystal-lamp.ru/uploads/files/81735096589.pdf
    • http://wisdomtours.net/upload/file/jadagupogozo.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/86309357519.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/3265619653.pdf
    • https://transmilenio.net/datamont/userfiles/file/gosabasonumumo.pdf
    • https://hyundainhapkhau.vn/upload/files/65934566549.pdf
    • https://jkmart.net/FCKFiles/File/66793613038.pdf
    • https://reclamesticker.nl/images/uploads/file/
    • http://www.beautyvogue.ch/Files/file/jisexunol.pdf
    • http://ikkosushi.com/uploads/files/46253930513.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/5766610376.pdf
    • https://iwistw.com/upload/files/wibisokid.pdf
    • https://swaarm.de/app/webroot/upload/files/liwufomofusomep.pdf
    • http://agecarekorea.com/ckupload/files/93871122607.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/xujilideputuwi.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf87ba4dc---29124721796.pdf
    • https://hoya.hr/UserFiles/file/4818944879.pdf
    • http://zssadkowice.pl/pliki/32640593933.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/45659011096.pdf
    • https://monyetjoget.com/contents/files/kusid.pdf
    • http://maskaevlawyer.ru/userfiles/file/91478753329.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=in+on+under+exercises+worksheet
    • 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_off0000df52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
font_01_sfnt_off0000f769.bin
1a6c9ccca03d0f4b684ff521165246bbc4d1502951a2826f6e9bf19cdfd208ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10588 bytes
font_02_sfnt_off00010f9a.bin
54b02f662361317c688a6c4c714c09e001d766a65d9ebd3400685cb389487b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 17532 bytes

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