Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4317df4efbf7047…

MALICIOUS

PDF

90.2 KB Created: 2021-04-08 15:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c6fa25392cde29b55df2aba8a952c8c SHA-1: 9e8b33fd04e46cb4d82c454733bdeaa52c0dc228 SHA-256: d4317df4efbf7047b44ef014b3d5bf0aaf9d587f827783e896861bd0c65a22f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=cummins+8.3+engine+service+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fde002aa537b.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/iihaNjb/draw_it_multiplayer_word_guessing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/Kiijahf/zejak.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/jjeMBie/nexile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484107/normal_6006509151198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5fd81a8bdaf4d.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/Tibjdhf/15033234831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6013349d1a07c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5ff3cb8f4c04a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_600a841100c45.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/3PKnig3/hide_n_seek_winnipeg_birthday.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5ffd5b2e46c8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojokiguxan.epizy.com/31082385003.pdfIn PDF document text
    • http://tumezubix.epizy.com/biomass_supported_solar_thermal_power_plant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f69edc9-cad0-4574-adea-5ab985a23c2a/the_laugh_of_the_medusa_summary_and_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc90cec9-93cf-45df-8854-f57427040dd6/a_wheel_in_the_middle_of_a_wheel_kjv.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/dixebijovaxigizorovexezuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5ff1ad-8e96-4a58-92d0-bb37fe426e29/tu_puedes_sanar_tu_vida_louise_hay_libro.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/80894708437.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 5476 bytes
SHA-256: d3a79e3c5b16a1a71357b99596f27beb32cd3a2752d3962cc600415346b2dfe8
font_01_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 11368 bytes
SHA-256: 5654dc27992fa350b0dd540a40d40e772d7cc1e8ff8be772f3df4dca33492bea

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