Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d645db62afe9ece…

MALICIOUS

PDF

102.7 KB Created: 2021-09-17 07:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e1fe73c64fd410359c44b11960675ed SHA-1: cdf8aa806e9a4d29a9a2ef6069ae8e387b08e4a0 SHA-256: 3d645db62afe9ecee07be606f990d0b21b63dfde1177afb3e971f22b0046fb4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://stka.gr/ckfinder/userfiles/files/2947002570.pdf
    • http://ilyxrace.com/userfiles/files/17329496408.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/sosabifef.pdf
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/kiwono.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/88805488529.pdf
    • https://groupunsur2.com/contents/files/mufogeselalezinosijekukev.pdf
    • https://markaoyun.com/calisma2/files/uploads/rorafixofutatirozizujebo.pdf
    • http://dawahcity.com/userfiles/file/zedukiranamuresafurus.pdf
    • http://gniortho.com/files/Upload/file/nadesot.pdf
    • https://ochronaskory.pl/pliki_user/File/69413955659.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/jozusevejepojetufo.pdf
    • https://zd-zeta.com/uploads/files/202109011410016859.pdf
    • http://vuason.vn/upload/files/92692058258.pdf
    • http://onroerendgoedindex.nl/images/uploads/zikegaretepow.pdf
    • https://bacninhonline.com/webroot/img/files/lejijitodi.pdf
    • http://geostudio.eu/userfiles/files/64817454217.pdf
    • https://aviseco.ro/userfiles/file/43422765356.pdf
    • http://parfumland.sk/upl/89549026134.pdf
    • http://maiodi.com/userfiles/files/xolitekomotewadusomu.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137990d4322e---guvames.pdf
    • https://titishop.co/upload/files/gesikeve.pdf
    • http://wsmr.us/userfiles/file/vegid.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/lujixopepipetanuru.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/kumaxuru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=200+battery+life+quick+charge+apk
    • 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_off000128e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 16792 bytes
font_01_sfnt_off000140f4.bin
99a14eaada45633109539317ed4c14694c4b1bdb2edf20d0e08ad2b4f1adbaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 19132 bytes
font_02_sfnt_off0001739e.bin
83e6a0f4730dccf20dca7b2f08e6491a733188714f7dbde8aa088c7633f13fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1739E 11104 bytes

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