Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6f7127a1b76a83…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d937f35c8078b53f8037fc33df98f83 SHA-1: 4e6fd04496355710e29a5803a66706d2ed7ce461 SHA-256: cb6f7127a1b76a83b94860993d369cb48b425cb38f99fa15c0169e110626afd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The 'PDF_IMAGE_LURE' heuristic indicates it's likely a screenshot designed to trick users into clicking a hidden link. The numerous extracted URLs, many pointing to potentially disposable domains, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fairtradeportal.pl/userfiles/file/kazidadupog.pdf In PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/fepelaxoxajarafidunexux.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/54739879868.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kesojebuvizew.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a48293b866e0ad6650642df36005bc6/zutevexewaxupe.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/72571608407.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/99330103526.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/46738514505.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/21760793545.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/redoreji.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/88256607157.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/gemilujosasizaxor.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2f0902ab---79829133306.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tidofe.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/jonanusupobomevewejopirud.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/56312562180.pdfIn PDF document text
    • http://demkapi.com/resimler/files/loxukofevowanukapozanuzo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/91872009669.pdfIn PDF document text
    • http://abc-tel.ru/data/File/74666845782.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/88941913316.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/mukovofunujes.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109131111202292.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/kegarewukomexe.pdfIn PDF document text
    • http://grotech.in/userfiles/file/wawixivolirebaweva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+3+flying+car+cheat+pcPDF 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_off0000b0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C7 13816 bytes
SHA-256: 83f973fa3722c2e5c0d982aba017e0ec217f6e883f7a57cd5f1edf0576777812
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 10796 bytes
SHA-256: 89b9c05a3b8e083c79d9505572904b5ada312d3b9e1f8eba7456f98b38de2a1b