Malicious PDF — malware analysis report

Static analysis result for SHA-256 d241a7bd9a9f7522…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 07:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d0785d0824d4fbc070082daef8589cb SHA-1: 65f83846aef7e094088a718725f9809d2411ae1f SHA-256: d241a7bd9a9f7522d9c7672037df8d406a6413f6dd1ad982888dec7df80cd5f3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to obfuscate the download process or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://suamanhinhlcd.net/userfiles/file/wozofevezagemit.pdf
    • http://omeofest.eu/userfiles/files/50440482324.pdf
    • http://abovomedia.hu/_user/file/polafo.pdf
    • https://esofagopisa.it/userfiles/file/widemulorikapenig.pdf
    • http://twtqedu.com/userData/ebizro_board/file/dotolesodel.pdf
    • http://wiskind.com/filespath/files/20210907165911.pdf
    • http://konstruktor33.ru/app/webroot/files/files/fugifawisetenagevag.pdf
    • https://keluargamimpi2.com/contents/files/84463393974.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/37735829979.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/44af2c439db0beca77b324d41c57a72e/nigovulukavejaputurinof.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/14188753347.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/29905332399.pdf
    • http://old.smartplus.pl/ckfinder/userfiles/files/zekixaxutosuzudi.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5d9c462f1707e5037856c0e877bae368/xazoja.pdf
    • http://rudolphalexander.com/uploads/files/7137658877.pdf
    • http://ugyvednok.hu/userfiles/file/20643654065.pdf
    • http://thegioixedap.net/upload/files/wataninenis.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/42821897412.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/degigog.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/88292335802.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/9371909576.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/nukobakaxas.pdf
    • https://ataru.site/js/ckfinder/userfiles/files/zutoxesariw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+12+redmi+note+8
    • 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_off0000dc04.bin
a075ecb8ccbec86b92576599c497fb590c2bcc9ad16574605b33d2202a826668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 17624 bytes
font_01_sfnt_off000109d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 16792 bytes
font_02_sfnt_off000121f0.bin
8a9f0796db7ee0e7c2e6dbb55918673699b793806aea98793343c205baf4a172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 10396 bytes

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