Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b6d1a5eda3d905…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 15:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7589c925f93e4e656a063490716ff6ec SHA-1: 4f44b8703d5176b8a5b2c0ee65141d86fd71b01a SHA-256: f6b6d1a5eda3d905050fc5b08bb0468938448729747c8f18f790149679566849
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many distinct, low-reputation hosts. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bangkokmagnetwire.com/ecodev_test/image_system/files/zopuro.pdf In PDF document text
    • https://5udua.com/contents/files/suximisirawozibugotekix.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/68073950163.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/15947665858.pdfIn PDF document text
    • https://cardolf.ro/files/18415763996.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613159bbaafe3---93159185672.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/94366511468.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/33265324457.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8ae991f0265ce733cd46b97d5f2e755e/dibitarudizaximifufu.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/jurimigove.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/xodakamimosivij.pdfIn PDF document text
    • http://unseretochter.com/images/file/49379149680.pdfIn PDF document text
    • http://contelex.it/userfiles/files/20368901630.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/76793053955.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fexupude.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/35550081120.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/82928548564.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/6117768587.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/fatusowilevobarunubas.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/86847232146.pdfIn PDF document text
    • http://ladna.pl/user_images/file/ximafuxojagomofujapad.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/98022314038.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/93113899973.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pelofedimitexafufoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+studio+simple+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 17516 bytes
SHA-256: 8e7705e316792be0d6bdb2819dbba34ef9cd85ebb921c8b06bea31e376f01d1d
font_01_sfnt_off00011b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 10816 bytes
SHA-256: 95fbf523b265fe8b78bdd3a2d932150dac80732cd88d7768884306b7ad6b9d65