Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0e4122cefd711f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 21:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3946892e27889465d904d0b119ceba6 SHA-1: b33eb7c677266a89fb101b54bc5edf30cc2c4a0f SHA-256: 5f0e4122cefd711f23c53213e1e074c61e7e1d7cbc3377a2de154b3185afe9ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as a phishing trojan. The presence of embedded JavaScript and numerous external URLs, many hosted on disposable domains, strongly suggests an attempt to redirect the user to a malicious site or download a secondary payload. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=turn+off+data+roaming+android
    • https://optical-axis.com/uploads/files/202109102017598291.pdf
    • http://franceplus.fr/userfiles/file/zijiwimaxakabi.pdf
    • http://khautrangkhangviet.com/upload/img/files/fasin.pdf
    • http://pekingtogo.com/uploads/files/donumenir.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/79367790642.pdf
    • http://prograsifkalip.com/files/peponifazexaxaworajuwig.pdf
    • http://9262895.ru/ckfinder/userfiles/files/87423717256.pdf
    • http://etkenkalip.com/files/kejakebutejibituzuxuz.pdf
    • http://tobn56.com/UpFiles/file/notebapumigeri.pdf
    • http://avision-italia.com/userfiles/files/35758039932.pdf
    • http://motopujcovnateplice.cz/userfiles/file/debolevenejiwom.pdf
    • https://agrando.cz/files/file/88156856470.pdf
    • https://cmf8.ir/data/file/89492654038.pdf
    • http://zzzwchem.com/upload/files/14386648941.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/geturago.pdf
    • http://tincorner.vn/uploads/files/wojeriwetegepewaga.pdf
    • https://kingwrapcarspa.com/upload/files/37321803945.pdf
    • http://files.ibiza-ferien.de/file/40301754016.pdf
    • http://www.anaja-inter.org/public/file/22689699650.pdf
    • http://unewstoday.com/task/userimages/file/getawiramavofosokor.pdf
    • http://aven.su/userfiles/file/7170539091.pdf
    • http://studioingegneramato.com/userfiles/files/tozalazolixegatorug.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/18920549090.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f9a403e4dfafb67444c49892de9686b/sumaso.pdf
    • http://ambvetesopo.eu/userfiles/files/sumip.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/lagaramimux.pdf
    • https://gruntbudowa.pl/files/file/guduwejaxavexizevolipafoj.pdf
    • http://heimundsicherheit.de/userfiles/file/44651508500.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_off0000de62.bin
ba291bbb2ab4a2265f40fb08dc825c13c81e0bd716c2d7d40522f148b4dda0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 10416 bytes
font_01_sfnt_off0000f5b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 16792 bytes
font_02_sfnt_off00010dc5.bin
ae9c4eb7ec510a2844108857c24e4a48a5330ba4d120d2cabd412a3cd7495999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 17844 bytes

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