Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9c70a76a3b719e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 01:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b8369ce547a35834e80f09fb7b2f4d4 SHA-1: 59541c714b7c2c88eaecd2cf0dc7d2f46dfa168b SHA-256: cd9c70a76a3b719ea5767ca2d712a76dc13126e4eae5ea03f4bf2bcc7a909eae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

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://xajibur.ru/award?keyword=lucro+arbitrado+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5ff17328e260a.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/hubspot_buyer_persona.pdfIn PDF document text
    • http://zuduwamani.mypressonline.com/2017_toyota_camry_custom_seat_covers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fe7d3e812222.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvivemu/gi6jiig/95758557011.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/doteposumetasaw.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/xazubeguxaziwelejexa.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/qualitative_research_for_education_an_introduction_to_theories_and_methods_5th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/hO4cvJ1/parabozunitukedavizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5fcbb8489a4d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5ff4c38dd150f.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/hbtyhgj/turtle_evolution_mutant_turtles_clicker_games_unblocked.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/5769750050.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/fOgj6Oh/diep._io_sandbox_secrets.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/WK0jfsh/98624293765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/unix_commands_cheat_sheet_2019.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/77140666532.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/yearly_xbox_live_free_codes_2019_no_surveys_for_downloads.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/dcs_world_mission_editor_triggers.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_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 5020 bytes
SHA-256: ee7ab07305b849ff99ecc7d8d845c7c64e6aa395bab32e07eb5208d601d54882
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 12232 bytes
SHA-256: f64f8ef537177fadfc6319ddd15660f47af21e6e3b5e7c3878ee2bd26b12ecea

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