Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dfa995daeca727…

MALICIOUS

PDF

87.2 KB Created: 2021-10-05 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f27e9a9489ca59a168b0f1ea2be17c4 SHA-1: 15f29a32eb5cf060755a669b9ee96c18c5e6ebd4 SHA-256: c0dfa995daeca72750321678ed02222ae5122efaaab696c6b2d9767d5544cbb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://binarbaidservices.com/public_html/userfiles/file/35610429806.pdf In PDF document text
    • http://lynxauto.ru/userfiles/file/90957333347.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/jovobakizupekibibu.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/lolimisivixulakupelajog.pdfIn PDF document text
    • http://hodori247.com/uploads/files/49150884481.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/vozaludosomiku.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/39593347672.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/jikataziguwaluxawivebek.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/23412892459.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/22107919434.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/dufixijurifo.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/wamapenosejojusi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4db3d611---65908313699.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/dimakafanupafok.pdfIn PDF document text
    • http://pronobile.com/catalog/file/ketozetifo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423bb49956f---41824833835.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/pazibexemubot.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/13770270901.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/damiwob.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xeloturugitigekibolefe.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/50271868835.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/gepaluselevusadowidetigo.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/kurijojosuviko.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/71268943999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+splash+potion+of+poison+in+minecraftPDF 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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10912 bytes
SHA-256: 49d689ebf3c55601bac046b0ae95467b0618e39b701c4ead42be3104349231e4
font_02_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 20628 bytes
SHA-256: 1592986b57d1a7ff7762878060d87acae54f33117e946417a14a6276e0dff34b

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