Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c45d4f089636ea0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 01:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a7fd422c026e19e0fbc6375a348b74f SHA-1: f5aea6b87512595357977792ab797bc3eac6b292 SHA-256: 3c45d4f089636ea0b8d081b291cea541d8c823e48ffe12c7d139a1667692a547
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 https://garglob.ru/uplcv?utm_term=how+to+find+your+deleted+pictures+on+android PDF link annotation
    • https://bevasilicones.in/userfiles/file/duvafevulabuziw.pdfIn PDF document text
    • http://industra.sk/userfiles/file/nojojozederesu.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/99291868950.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/23503944020.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/ruvutajajomipadexi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1p3p05osji1vk3s87l56mb3ok1/walotetoxabomupapuv.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/26869529914.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/70220259483.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/divubapezepajudabixivekon.pdfIn PDF document text
    • http://swhos.com/upload/files/kadozisewa.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/viwoxamodadatofujolanat.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/70502363760.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/53380176566.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/5615214673.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df4c9b490c---buzabanulalumit.pdfIn PDF document text
    • https://greenways.at/userfiles/file/pururak.pdfIn PDF document text
    • https://jagominum.com/contents/files/18183279746.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/2225364103.pdfIn PDF document text
    • http://c-six.it/userfiles/files/62288784499.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/45082045237.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/zorekog.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/12240797064.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/notudinajewezatuzatopuxok.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/55639355818.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/65751267214.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/71205895161.pdfIn PDF document text
    • 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_off0000b5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 10904 bytes
SHA-256: 5daf2644a5f7835f3a08994a9b44ef3f510e86c647ea498967adebd1724c3e9e
font_02_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 16580 bytes
SHA-256: 721e36d6c904d51e6e53ac7447fe32145d5aef6d89f503f2fed8c032a41fce5f