Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb273cd5f0a6794…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 05:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a4f9246c06b892e4c43e9f86486aac29 SHA-1: 0f90ef2c7dc8e7d9ac86d673864950b386b798ba SHA-256: adb273cd5f0a6794a0448a467beaa8a39ddf19b0ab4199654996bdd98b273ba4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and a click-outward action. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 67 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://tataservice.it/userfiles/file/86987089492.pdf In PDF document text
    • http://medob.org/SITE/files/editor/file/90959708859.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/89491683539.pdfIn PDF document text
    • http://palami.by/images/file/xerekutokifuralares.pdfIn PDF document text
    • https://ms2oke.com/contents/files/94263186095.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/dowozagurov.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/61556107710.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/wujuberupu.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/dafudafepafolisixelos.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/koloj.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/96412370394.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/sipixolageduwase.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/96428016568.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/16478135265.pdfIn PDF document text
    • https://coevent.ru/upload/files/29968383260.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/guvowelotoresuw.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109080559041283.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/4478447443.pdfIn PDF document text
    • https://linardi.ru/files/file/24982052847.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/xubonif.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+omega+ruby+rom+download+pcPDF 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_off0000adea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FC 13848 bytes
SHA-256: d43dcd82492d2999a7982117c4d4c8f9c377cc1fa14e0562be1d57fbd097b8c3
font_02_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 11032 bytes
SHA-256: b610e82f410fbab6c06d81584786bd46f6160aebc665bad67b91e04a0e84a1c6

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