Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a310c786ac3ddd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 21:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deac41332ae05972816800b8b3af3969 SHA-1: 4088852989b225fca9cbaa806e682dad4d00f65b SHA-256: 97a310c786ac3dddda2994e64316b57c2733fb5c1f743fd7a19315b1fe45afed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming scheme. The PDF's structure and embedded URLs suggest it is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=dragon+ball+z+episode+233
    • http://rancholasmonturaspremios.com/campannas/file/91370440597.pdf
    • http://lixupeng.com/uploads/files/67474446719.pdf
    • http://saigonford3s.com/uploads/2021-09-14/images/files/siboxa.pdf
    • https://zohopin.com/calisma2/files/uploads/vakapiworalow.pdf
    • http://musorcentrum.around.hu/files/article/file/52557888840.pdf
    • https://dichvuketoansg.com/luutru/files/daruvene.pdf
    • http://nfraccon.org/userfiles/file/49965564181.pdf
    • https://baxsporthorses.com/userfiles/file/xiwezavipitirap.pdf
    • http://biplano.eu/userfiles/files/vekixemobumusa.pdf
    • http://gainliving.com/upload/editor/file/megijitabokebalob.pdf
    • https://patoman.ro/ckfinder/userfiles/files/loxizelufovedib.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132449f0395a---8418123551.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/31912237e444ac874fe3942aeee1c43d/12458293232.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/tubiwaverulutonogureke.pdf
    • http://csc020.com/userfiles/file/20210914170912_373zxu.pdf
    • https://manorhair.com/uploads/files/202109060806149007.pdf
    • http://rowerowaszkola.pl/imgturysta/files/34442612484.pdf
    • http://ciaooo.ru/uploades/userfiles/file/bumug.pdf
    • http://sintjorisparochie.nl/userfiles/file/61181833056.pdf
    • https://landtop.com/filespath/files/20210912041032.pdf
    • https://yoimart.com/upload/file/20210901202632.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xotoz.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_off0000b47b.bin
710c99eb9ffd1652adab051ad8e52c582c49622ee1003a733029ba2bf4c8dba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 10964 bytes
font_01_sfnt_off0000cd99.bin
66d821563ce21a37db9c39864802d6675f134f24344a7598b1627c4e93576a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 18200 bytes
font_02_sfnt_off0000fd6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 16792 bytes

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