Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72240c83a9da6e3…

MALICIOUS

PDF

69.0 KB Created: 2021-09-17 07:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aab42623fdafe4048064577a53f27832 SHA-1: 4c44eaa4331efbce0af6cc2ab602b6c3a33e962d SHA-256: d72240c83a9da6e3d465a1be8c6b9564735bb45cd72034ebd9ab7410472527a2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and appears to be a screenshot, a common technique to hide clickable elements that likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 69 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.
  • 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361e09a72c---34890012660.pdf In PDF document text
    • https://auto826.vnpec.xyz/uploads/files/39022896800.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/lijexojugogatizibu.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/savuzidunonogefefa.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/najesadojemolaxovasusono.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/zovoxojemodewizesiliziva.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/98189609658.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/solenoketo.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/68697431289.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/22033034968.pdfIn PDF document text
    • http://benly-carson.com/product/files/98532293038.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/83885248609.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/tisidi.pdfIn PDF document text
    • http://bakoca.hu/files/file/70901362965.pdfIn PDF document text
    • http://wajl.net/img/file/202191011354.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/707cbb047245837bc12eb0d3cef0490f/fukolevededelofozazemus.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///medunefamunatijazajasalep.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/74540387498.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69114952726.pdfIn PDF document text
    • http://dentherapia.hu/files/file/28837203788.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/3581736954.pdfIn PDF document text
    • http://101balkon.ru/upload/files/4222073351.pdfIn PDF document text
    • https://majubesar.net/contents/files/fiwanoboxogojupujawezev.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/12547361033.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/waboponexobuwewetoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+ip+webcam+app+for+androidPDF link annotation
    • 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_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 11016 bytes
SHA-256: f913b89b6b329d3580108d45f4e8bfa4cc49aa5f258dd5af17d4cbb3f4ccc826
font_02_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 13624 bytes
SHA-256: f5837b97989a7ed8fccf4438c904b5f1f9fdc82102d42e8383e80848997319fe