Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a6d5a64e39e801…

MALICIOUS

PDF

63.9 KB Created: 2021-10-01 16:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a79ca490df4d5b43ef3cec9f07a8beba SHA-1: 889f7a6c189ca89377a7fef9260a44dc1d772343 SHA-256: a0a6d5a64e39e80111cd97b9c4cfb53868cb8dfeb02038b84b3c32ba1bf29489
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF exhibits characteristics of a phishing lure, including being an image-only document with a click-outward action and a small file size. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 63 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://edv-denk.com/userfiles/file/wobuzumi.pdf In PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/batubutejafajemapoweto.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/9499838499.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/42504396206.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/doleto.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/70882811871.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7ere896tmrfsbhm7feq1hqrem6/rujipafavinuvovisufukofap.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/loroxop.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/39672722367.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614785517aa0f---63982507159.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/bezeluxeput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=naruto+manga+pdf+onlinePDF 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_off00009fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB7 14072 bytes
SHA-256: 1ae3353edccd0c9ffb1641cd58892605661ad90f9ccc2d736a8bfa7fe873de1a
font_01_sfnt_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10748 bytes
SHA-256: d67a54972eb17c49c6782fdc29f95d3f9bf270aaf2223db6702873dcebf1bbf3

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