Malicious PDF — malware analysis report

Static analysis result for SHA-256 24245d0456bfbd1f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 06:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c647d591c917a23c886d7996d4ed111a SHA-1: 50f9887e43a9ffba9f6339b79189fbac4967d1f6 SHA-256: 24245d0456bfbd1ff1e360cf80142584567c046c1834d1c72ca2c9ae3159d269
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The presence of numerous external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or link-farming campaign. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kovospm.cz/fotky/file/naxovikut.pdf
    • http://pwmtqatar.net/userfiles/file/domog.pdf
    • http://be-now.pl/userfiles/file/weduxalaminakenoxibuz.pdf
    • http://gibisch.biz/files/files/20882071155.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460dc61f9f8---35823140751.pdf
    • https://lalicorne-hotel.com/userfiles/file/82848977249.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/49902533965.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161416f133073e---96457848005.pdf
    • http://diagnosticaedilizia.com/userfiles/files/61946777429.pdf
    • http://agilesolutions.in/uploads/suvopelixufizikasizuxawer.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0910/c68c8169524a74f5b2c1de9fba4c2672.pdf
    • http://skncn.com/u/files/rowufofopevovupedezamaloz.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/rasisinub.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/50937070483.pdf
    • http://kd-council.com/upfile/files/zonajud.pdf
    • http://paoladebenedetti.eu/userfiles/files/66102648153.pdf
    • http://constantemails.com/userfiles/file/1631529887dimosuvulobamok.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/64542984542.pdf
    • http://carnow.jp/js/upload/files/6555411127.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/92089362683.pdf
    • http://ya-ke.cn/admin/upload/78079923020.pdf
    • https://weeb.nu/userfiles/file/85536860671.pdf
    • https://vietnamwelder.vn/uploads/news_file/33762627589.pdf
    • http://dioblina.eu/userfiles/file/dudibubireguxegatakemag.pdf
    • http://woodbridgeabw.com/uploads/files/xekajaxebukune.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=associer+compte+google+telephone+android
    • 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_off0000d520.bin
4f470dd7657e7baad1927dcb3102fa409c25e558cb55710237c4bd8a6b36da59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 17336 bytes
font_01_sfnt_off00010253.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 16792 bytes
font_02_sfnt_off00011a6a.bin
acab3ac9667e2aeb23c8bda6d15454ec1f54abd5087c120c0a6f8404cae824da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 10944 bytes

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