Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af7f19753c9fc65…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 06:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 549da7a03e6bd595fcc51218ba0fc40a SHA-1: cf4aa96307d8ad1347fb9fb3a8d690987065cbd3 SHA-256: 3af7f19753c9fc65551668d9bfc92b7c3110596277070d503fd40bbf25dc812a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also identified this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5a3860de---gerubegikimilovuwijawozat.pdf In PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/85394855053.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/29532397468.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a34d0a02---51466352452.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/43981455980.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/3955018601.pdfIn PDF document text
    • http://airsoft1.ro/files/file/puvuvimejur.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/4029270678.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/33767981238.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/55267911785.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jowawavoladoxekanifu.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/6037969511.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/31838603.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fotifirovip.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/mubunajulajisowete.pdfIn PDF document text
    • http://sushibelovo.ru/files/levesujelarixulabofoke.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/86356188664.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/divewasokexul.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/44637763592.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/puferoduvusemimibizawu.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/jipovodunoke.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kujixewevufubujapi.pdfIn PDF document text
    • https://aayams.com/userfiles/file/jijakobujoxomuwupafad.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/82054459711.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/dowolunigukopodozetivamem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rkpx3+android+updatePDF 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_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 10684 bytes
SHA-256: 14a9c2349e851c12b33f1e62e7bcaae0d106f37b8c21b7013c811fabb5bd2f5f
font_01_sfnt_off00010934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 20844 bytes
SHA-256: ee01d052658f65261968183f710bab7dbf2d25a32f3cc8e6ce6eed59d1d95b4c