Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a9a3552c26426d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 03:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 72988323a34896be9cc85a54c43ad08c SHA-1: 9f97112c2d1442e7d2a732b3b9eb034fc20d0a2e SHA-256: 80a9a3552c26426d1bc3595e1e1cca2b6fd360b62ea0fa0df3e272b3bc78e68f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including one pointing to a potential download URL, suggests it's designed to exploit vulnerabilities or trick users into downloading further malicious content. The heuristic findings of a 'link farm' and 'download button' lure reinforce the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=vast+survival+mod+apk PDF link annotation
    • http://espicycooking.com/files/file///74156999235.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/30349185136.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/65216131101.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/85869205044.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/titidevemizomerova.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/sakivabalunabavubefa.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2030a2daa35d2f63bae82e5c88a8212e/vexufujibusu.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/dubuzenejemeguwi.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/lesipatororifebigamibofod.pdfIn PDF document text
    • http://sjanzee.nl/file/61735259478.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/90672689170.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/xiwivifarawike.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/82064182917.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/97636179105.pdfIn PDF document text
    • http://emannsltd.com/userfiles/nuresixudotapeleni.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xuponobedutuzupuzokepojib.pdfIn PDF document text
    • http://airfa.it/userfiles/file/24813111466.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jubanupasebaz.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/35156402870.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/sebigiluwuxarudagepokegu.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22807670458.pdfIn PDF document text
    • http://shahgrp.com/uploads/92031103290.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/73709529755.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ab644832d468c8ce2a44c2dac009ec83/xojogeliwezobalopa.pdfIn PDF document text
    • 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_off0000b13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94E 14984 bytes
SHA-256: cd59fd28aaa5f22756d7c280429393ebacd4a9c1bde95600df3873f5345c20bb
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10544 bytes
SHA-256: 1f5acbf7cb413da86df4b3f52ef6a06ef6fe60fbef390f39d47e4a164d671ed0

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