Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef65ab3a13ba736…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 20:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce82251a329b9b1a175867895d50c560 SHA-1: 305278528765e94cb6e28575259778d7e1053717 SHA-256: eef65ab3a13ba736c1787a987e52903a95c7ea34b0aca232a1e89b59937bb7f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and numerous external URIs, indicating a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan. The presence of many links on disposable hosting further suggests a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=among+us+mod+apk+9.9 PDF link annotation
    • https://sdhouse.info/ckfinder/userfiles/files/zojojobalagel.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/40873450804.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bc55a8d8---tipevibajefupudaxe.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/97515242216.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/wilutafafifodakalago.pdfIn PDF document text
    • http://sql110.com/pic/49507911206.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/44179654723.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/90363679911.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/kejiru.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mebovigusagijim.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zutofefebaka.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cd60ff60---27245829511.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/dugebunejobixetokobudo.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/nipivadukatusutiniparu.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/69970374309.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/35687548730.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/22605616001.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/jawimegitil.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/657521012.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/78190072595.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/27094641792.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/bapejizonuxexurureraz.pdfIn PDF document text
    • http://x-mobio.com/upload/files/9245317863.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/69306108826.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/98393682839.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 17700 bytes
SHA-256: c3ff03c3eada9f6203c8a42b03b0d8291a253b537e9210af1c0b9ddfe931d768
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 10672 bytes
SHA-256: 772e03e93d41dc70a0f6b2bef99dc3537c61c98ddcc216a1432fb9ee76b538a6