Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8b170d44815d8f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 11:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 501ff32aeea3b09748e1e9299afdbedd SHA-1: 268816e93995031a30091b561a6cd3e5a4cbf658 SHA-256: 8c8b170d44815d8f46a5340896a92f0154361d71538e9790b38d2a718eb6e7b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ratchadatitan.com/UserFiles/File/ruwuxukozowo.pdf
    • http://thumpamonpally.com/userfiles/file/46414441769.pdf
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdf
    • https://www.karelo.com/uploads/File/gebawugexoz.pdf
    • https://maggies-handmade.com/UserFiles/files/7415044130.pdf
    • https://floridahouselottery.com/test/userfiles/file/49875136134.pdf
    • http://iglozawiercie.pl/zdjecia/file/koluzawisukejulogu.pdf
    • https://bda.ch/ckfinder/userfiles/files/tuwiwavu.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/femufewugoxogonu.pdf
    • https://inprovitbrasil.com/ckfinder/userfiles/files/nogogigu.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/nanatovupopopevifomamele.pdf
    • http://zsdbiopharm.com/upload/files/gevikakiwosiv.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a0f01ea29b5e981f147e0182be33beab/rejetagitogisolukulixoboj.pdf
    • http://verypool.cn/images/upload/File/vifavaxomibusorafanotibem.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/5152981273.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1847e4a4d20a775a4866aa43ebd01879/warelifinibixububowo.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/megeserasutidilag.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/fifutewanalenezanu.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/65294651310.pdf
    • http://pwr-tech.ru/userfiles/file/88505709016.pdf
    • https://ceccarmaramures.ro/userfiles/file/12816593821.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/70619849583.pdf
    • http://homeshopeez.com/uploaded_files/userfiles/files/30302382738.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/44439365515.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=locker+codes+for+myteam+2k20
    • 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_off0000dab5.bin
bb490f34ae5cc7bc2bf5ee497dd92535688fd03fd910220445e7ef2cdfd38196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 17976 bytes
font_01_sfnt_off00010957.bin
8250ea572cc6429a3bf1a8e3e0c3b097d972aa5dd52ad0097a3a3b275c6db617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 10800 bytes
font_02_sfnt_off0001226f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 16792 bytes

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