Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4222af38865e57…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 21:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ce89c1c403c3c2c7b760f5c4ee05ef21 SHA-1: 04c87c2ac92b85b7f85cb5ad56ee11f4f2f736a6 SHA-256: 7b4222af38865e57c2b9871abd93a6de27c9d682d0e8fe03e2baac7ef706fc58
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=best+multiplayer+strategy+games+android PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf3551a17---mimalekesokel.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/26645085542.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/86278246056.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81668616318.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/56964181980.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/13837377958.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41826675231.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/wuxagifawefagod.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/dotosalelaxadovokaf.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/93199338004.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/kelimurulupofe.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/miwimonifakosewigutu.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gopiwopusom.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/95167085832.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/72527337703.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/14333774720.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/72741181519.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/bababepeloj.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/48583548487.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/bidini.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/12353310271.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f337d8e163---40587826900.pdfIn PDF document text
    • https://ccskin.com/geektic/files/bovalukajixelogozovemiduj.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_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 17380 bytes
SHA-256: 1bc425ac44943a86d6c73bf0c759850c0480939b39e5cdf8fb6eaf97de2d3195
font_02_sfnt_off00013b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B57 11004 bytes
SHA-256: 4bdf9ec1c067895b77292a719a843ef8095048617176d5394a1b75af86b4aa12