Malicious PDF — malware analysis report

Static analysis result for SHA-256 10059a2bc0e57582…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 22:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e223b6076cb5c958eab24e98109c416 SHA-1: d23d765e3719598780b111244a0098d6421cee30 SHA-256: 10059a2bc0e575822e9dd6db82a042840717ed8c77821eefb35c504381d846af
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=reward+8+ball+pool+2020 PDF link annotation
    • https://semangkabiji.com/contents/files/98435112879.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/xagaz.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/pomarugoni.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/49704968909.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xaxuxadibewafagevakevemib.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/gosagatesaxatugix.pdfIn PDF document text
    • https://kiptep.ru/file/wazozaxerimosigod.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/lofojurafa.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nonimogoxufamomej.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/25422947283.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/50010681354.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/83ed96d492ea3c22958520747352ba20/34863080376.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/87490225419.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f97ecc6eb---pufuxizamasebexodudujazok.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xatorejuluxularaxofakaxel.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/sifurovegewusemuguje.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/53790669886.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kadanovobuvibuv.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/829962897.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sugikuvixadedere.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/sidaf.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/pezidisopose.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dekufelasoxufeva.pdfIn PDF document text
    • http://headrepublic.pl/images/files/54139398053.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/59965287804.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_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 16388 bytes
SHA-256: d3047b0ff8ad413ed53d1e6f8294339c75ce7a1585dee6c7a86408690fbae091
font_01_sfnt_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 10644 bytes
SHA-256: 21bcf5be51aa6b280e1c1cb8b6ba17610e3e0cef896a92282b0a4389e0f70c1d