Malicious PDF — malware analysis report

Static analysis result for SHA-256 d655c48062c516be…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 05:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c281db7845ffff26a06e6c039dc8a2d0 SHA-1: 5417472e654de081447733744f09c894a8e78f9c SHA-256: d655c48062c516be010e83617904539ca1609475eb77c143e2b102ba8ef26cb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, indicating an attempt to redirect users to malicious sites. The primary function appears to be directing users to external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://huntic.ru/uplcv?utm_term=cool+emulators+for+android
    • http://kdekdyjak.cz/data/6219968569.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bef614b06f400b305a66f0b50aaab3b9/zozameboriwixofewefaxot.pdf
    • https://cantarefides.ro/admin/userfiles/file/68474300545.pdf
    • http://designklasse.de/ckfinder/userfiles/files/93835834666.pdf
    • http://dasbluemchen.com/boposixedaxiwow.pdf
    • http://milkyway-vn.com/upload/files/dexunubavakalajomonu.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9gfv2aadpqt3usrtherd1bajot/47534120705.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/50223476105.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/tofakisud.pdf
    • http://rulife.ru/ckfinder/userfiles/files/52107760623.pdf
    • http://meskerjager.nl/media/files/dalewewapip.pdf
    • https://sportsslife.net/upload/ckfinder/files/75620049258.pdf
    • http://adgroup.co/userfiles/file/66055564659.pdf
    • http://ellenia3.eu/userfiles/files/rexisefipoma.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/79535141463.pdf
    • http://ityab.com/cache/fck_files/file/wimikewezuj.pdf
    • http://uklearningnetwork.com/userfiles/file/43883830340.pdf
    • http://dichvugiayphep.biz/upload/ck/files/womazajatoliduxevun.pdf
    • http://smolninskayahotel.com/userfiles/file/88026126120.pdf
    • http://fxlcd.com/upload/file/kexen.pdf
    • http://gocep.org/data/userfiles/files/91964524311.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/poselizololudaboj.pdf
    • https://cezartravel.hu/userfiles/file/tirojogexodigoseriwitusos.pdf
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/wibajimaxetuzafujukiva.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_off0000f905.bin
10e2d334f7528171d900d38f66f52543eb9181a44dc50114bdeaa43db38e39d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 10648 bytes
font_01_sfnt_off00011160.bin
cc72103137fc69f1f95d158ef327d2178e63fda7bc3b43db96dc222a885953ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 17536 bytes
font_02_sfnt_off00013e94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 16792 bytes

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