Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3eedf6b5ac7a05…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 01:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d1d36de7d399b3f02b764dbf27120b7 SHA-1: 02ce4c250ca92e911ec4931d5d39db8262588401 SHA-256: 4f3eedf6b5ac7a05306067c61c1bc4f1e6a0903a98140ffeac7dd921f453a6e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

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
  • 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 http://lynxitservices.com/ckfinder/userfiles/files/tosimo.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614106064b458---muwenavuvukesonuta.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/91991421747.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/14e068b4157887a6baefdbf6f2dd8901/27116106383.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/7072482970.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/kojag.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/28083535338.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zuxixareguzowaxaroj.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/49219090487.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/womixisut.pdfIn PDF document text
    • https://iword.de/userfiles/file/naviliduwi.pdfIn PDF document text
    • http://land89.com/ckupload/files/73806428590.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/33087657253.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/462125043.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/fazutabalago.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/28062417581.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/19411090339.pdfIn PDF document text
    • http://metabolit.ru/files/file/zagonugegexoviwaxejum.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/55098615793.pdfIn PDF document text
    • http://mousike.it/img_ins/files/16262481381.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/24064010970.pdfIn PDF document text
    • https://costarica4d.com/contents/files/80579354859.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/9167718523.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/xugoxapumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=oxygen+os+call+recordingPDF 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 15824 bytes
SHA-256: a0439033a10dce3933551d5e8e40f8e39af06b03007cdc2ff6827794a441f2f6
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10688 bytes
SHA-256: b9f44d37854b3dacc41d59b51edfcdb1e1fe8803331d63f8861dc2d00c0c5c3c

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