Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37f498e7ed987ac…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 09:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5883ebc7d36272e69a69ef6943df8221 SHA-1: 74a770a91ed33031b5dd21c1caa0ea6a4be71455 SHA-256: c37f498e7ed987ac013773a199dbfef2ac5769cae8a76c7803c668e3ff295a2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its image-only nature and clickable action, typical of credential harvesting schemes. The document body is heavily obfuscated, but the heuristics indicate it's designed to redirect users to external URLs, such as the identified 'pistant.ru' and 'euforbiabulgaria.com', which are likely part of a link farm used to distribute malicious PDFs or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=android+templates+free+download PDF link annotation
    • https://euforbiabulgaria.com/uploads/pages/files/31580377638.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gewelix.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210913082907.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109060828024639.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/90057012883.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/movimolobot.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/92960636256.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/puvuwigilemafupavi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/70843497917.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9f3fed266d5a156ea7a4f5ed3e74b10b/mafigojifedimovapa.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/48415442645.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161352ba5bec1e---wekegodapuwisuxan.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/95625787410.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/31772959170.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/98093793578.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fuvozudewemelafa.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/54923544644.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/59496214010.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/xatuxikudedenojiz.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/45880341884.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volugonapoj.pdfIn PDF document text
    • http://e-district.org/userfiles/file/33605530443.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/14787712553.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jaluzevi.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/66516508137.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_off0000b046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 14060 bytes
SHA-256: 8d43b4ea5c91aac4b0b7cea9774639dc411825f08072f0ceafb7abd99850d579
font_02_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10724 bytes
SHA-256: 85afe59b7327261615ce353943a6476ff09465b9ba33210c920794c495640f57