Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a2889797c7f31e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 06:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e05506eec59244933af1c1f0cd955c2d SHA-1: f83dc7f2d83f56286bb8bbc6f0cac6ad388edb30 SHA-256: e9a2889797c7f31eb784815eb88fa0eb7076e9a1cd165f681cdacf2b3ddbbd74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vnos.vn/app/webroot/uploads/files/99250133179.pdf In PDF document text
    • https://mrdak.cc/uploadfile/files/85627923122.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/14555611475.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/fetif.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/zizibef.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/76187401724.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436edf9ef58---9845055098.pdfIn PDF document text
    • http://qzgj.cn/upload/file/90397047925.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/22787262966.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d799a75b7176cef649b39f1dd43bee54/luturetodenex.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/xabinomonorum.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/28372604682.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/jurelutu.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/97035759408.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/24332511354.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/matopikijob.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/38179748599.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/53160311056.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/sufowamarigugekibekik.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/pozodok.pdfIn PDF document text
    • https://edusfera.pl/upload/file/dabebimesivemegezavanuxor.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/togotovisurarem.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/berawipawewokefezodudog.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/sezuvilifebalode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+change+audio+balance+on+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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 10800 bytes
SHA-256: f62344b670e4af72a687290e8d1f8ba7e6948cc4428b18076c3fa5a498295da7
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 18144 bytes
SHA-256: 5835504bdde23441df297d1e71943b658d65fc8983818b41a1fcbc1640a15ce3