Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91655fcc4413d64…

MALICIOUS

PDF

66.5 KB Created: 2021-09-19 03:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1f57429b68c17ff9f9f0ed185f4b818 SHA-1: 0c38fcf0eb446da6b6e9bec6a9a501c51c787535 SHA-256: f91655fcc4413d64ef89e3d672287acff2aabc57d227f2b54f3904959018d616
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9eef7f245---71937333217.pdf In PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/kazodabomija.pdfIn PDF document text
    • http://a-pluset.com/userfiles/dabalog.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/vewunubetiko.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/8982183973.pdfIn PDF document text
    • https://aneri12.eu/res/file/xivugas.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/lesexufatofof.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/8740386558.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lagewigup.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/muzepuwosujumaj.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/31634095107.pdfIn PDF document text
    • http://esistore.be/userfiles/file/93665526500.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210915210426.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/nadedadat.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/47562000090.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/tufonabogomaxawebeb.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/7180787276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=state+of+affairs+putlockerPDF 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_off0000a71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 14424 bytes
SHA-256: b4e77acd117e4252e37c9efa068082fd3e0748e6b024c607c457ac0a87a23c04
font_02_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 10636 bytes
SHA-256: 88dac3110ca541e1cb4a820d0aad6f8c5d0bb19dece56b7bcefcaf7463d77ffc

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