Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36d159ad4dcb2e5…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 01:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c49c96c351069c4203e2ed38892ab48 SHA-1: 3521b5255d1069fc113044bfb027a57f014093b7 SHA-256: b36d159ad4dcb2e53615dabffa562481e939e8b074e351c5e6d5d71ca383a463
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, with one specifically pointing to 'irlanc.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=evermore+piano+beauty+and+the+beast PDF link annotation
    • http://sireny.net/share/files/88629194160.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161477f97b6764---sisawefaguxirajororag.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bebezadel.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/33929699808.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/63652933790.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/vutuvawimumopevonijo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48712678529.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/matera.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/naliporimakovupafevitir.pdfIn PDF document text
    • http://altus.pl/userfiles/file/gupegavovamizavufa.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/16105222359.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/debiwunujubudesezuxu.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/82124965800.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/duxibisufaxuseg.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/35512258041.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vevosaz.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kagimavodikedek.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/92308385866.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/33873008647.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1c8g5m4nhl6omr95ikt6e8uphi/49026854248.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/66122978268.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/8404411083.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/42026408302.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/86121963790.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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 11012 bytes
SHA-256: cb4f9c0f4de21126930489afffffc5adc9a6d2af840cc5522908d6bef21e5d6b
font_02_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 15280 bytes
SHA-256: 977bcbca8453f1929b83f9425e607639f75fcbfc26ecb63aec0c8decb8807d71

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