Malicious PDF — malware analysis report

Static analysis result for SHA-256 491c1f4b22f90ebc…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 21:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19c14921c6a9b2267249b4508896e58a SHA-1: 4a18054f071e7e876be2d2bdefaba02875112a48 SHA-256: 491c1f4b22f90ebcc0f27b23ada025654d08d48a8f49ed987d206b06c076811b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://nagymester.com/userfiles/file/bonaxesitasog.pdf
    • http://gurolmumcu.com/userfiles/file/serujiduzixum.pdf
    • http://infinijewelry.com/userfiles/file/37276195155.pdf
    • http://consulcongress.it/uploads/assets/file/69912598374.pdf
    • http://yuanhebiotech.com/upload/files/60031901781.pdf
    • http://220-wm01.netdbhosting.com/file/suvevogedigo.pdf
    • http://strandedtattoo.info/file/wogakofomu.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/povag.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/pukisi.pdf
    • http://xaydunglenguyen.vn/upload/files/55d5e1.pdf
    • http://greenbelt.abwingsmd.com/uploads/files/vadabara.pdf
    • http://satcomlink.com/userData/board/file/xevipuvitaxiwafigu.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3e68d5a08e63a02f35b2233eebcc70b3/94360372396.pdf
    • https://dudikom.pl/userfiles/file/kizosimirutum.pdf
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/tegosob.pdf
    • http://jolanyee.com/upload/files/202109250630568793.pdf
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/44676407896.pdf
    • http://fantasymusic.it/userfiles/files/70205394688.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tapezokogusulo.pdf
    • http://prasongp.com/file_media/file_image/file/batekosexijojisedufovip.pdf
    • http://weshare.vn/attachment/files/viximasuvomuf.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/wowomalu.pdf
    • http://tw-echen.com/uploads/files/202109191314567172.pdf
    • https://jackinthegymtpe.com/uploads/files/202109260206045485.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/jewasusutebebovuto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nice+words+that+start+with+the+letter+d
    • 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_off0000b079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 16792 bytes
font_01_sfnt_off0000c88b.bin
3ac8a357d3f9b92bd2db692baf0f225d464f8937d3ad727e83fc1fccfe52e45d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 14764 bytes
font_02_sfnt_off0000edfa.bin
db27a17a5afec4ad44c397511e8aef2322e172a1c7a60d7b32e2cac552e18a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 10424 bytes

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