Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb598933bd21274d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-11 22:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12f24d9ca6e388530bba81be31a21153 SHA-1: 0fef2ab16427bf3e3d54b0d60c6e520fa8f6beac SHA-256: eb598933bd21274df1ed7334853cfe3dc8a535e6430cc304081fe704be710879
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tocbirsen.org.tr/ckfinder/userfiles/files/zemowumokoporejafifexur.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vuwafinu.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/5255725268.pdf
    • http://strelnicebudejovice.cz/userfiles/file/26678603788.pdf
    • http://karate-talence.com/newsite/userfiles/files/84470205269.pdf
    • https://agentcctv.com/userfiles/file/wozefejovowagonugupazili.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/56183952406.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/48736951656.pdf
    • http://www.hausman.eu/images/wyswig_images/file/30241125762.pdf
    • http://mikol-styl.cz/userfiles/file/nomibatipepepufi.pdf
    • http://internet-trade.eu/UserFiles/file/33096906857.pdf
    • https://samavetpharm.com/userfiles/files/lozefetifugalavixivoko.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a0e42be3e831e5fc13c71f8639e15d0a/xobebabugizexige.pdf
    • https://marupyara.com/fotos/userfiles/file/57407794515.pdf
    • http://nikolalepojevic5.com/multimedia/file/duvolamajipevib.pdf
    • http://miskolciharsona.hu/pictures/file/23311599867.pdf
    • https://carsen.sk/editor_uploads/system/files/32237614851.pdf
    • https://viboot.com/ckfinder/userfiles/files/vovirilanojo.pdf
    • http://vocal.bpv.su/content/files/files/83873743095.pdf
    • https://songhongresort.com/img/files/99020035620.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/30120258.pdf
    • https://terracell.pt/images/file/pabebafixibinonobunexib.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/mezelafobatabotefavimex.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/zeveji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=get+parler+app+for+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_off0000f6fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
font_01_sfnt_off00010f15.bin
faeffeb4d06ab7dfd1214111e58f3b74d65595441255b83b9a22ea1334baa316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10364 bytes
font_02_sfnt_off0001268e.bin
1650cb200c6b868d3cdcfe2ec132f1d459eb81ad1a5549a6d7b6101ae07305f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 17284 bytes

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