Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e07cd3fb9a564a…

MALICIOUS

PDF

80.1 KB Created: 2021-04-20 02:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 40c71d7d328f9c30ff7d35871e1ac185 SHA-1: 1bd04df24420029fc306bfc08ea5abd2ad9ceb7e SHA-256: c8e07cd3fb9a564aa61fc1e7857bc62d6a72704065dea375c22872bee35baf8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=onkyo+av+receiver+tx-sr705 PDF link annotation
    • http://damvglaz0.xyz/710789106098oq9q.pdfIn PDF document text
    • http://nufudoze.getenjoyment.net/zijexegof.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/93648335563.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/adding_and_subtracting_rational_numbers_practice_worksheet.pdfIn PDF document text
    • http://titanof-filtr.ru/63192666783oyjn0.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/gevijun.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/nirej.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/92213029459.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/90843584840.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/62205442968.pdfIn PDF document text
    • http://wativeb.mypressonline.com/fonelomebika.pdfIn PDF document text
    • http://basagutidabe.sportsontheweb.net/49436690829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/aadhar_card_address_change_form_english.pdfIn PDF document text
    • http://wenares.myartsonline.com/netgear_wnr3500lv2_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff58192-c1b4-4a0f-9b35-f7e6956db577/how_to_reset_a_rinnai_hot_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2304ed5c-5e33-4e04-9d37-e06b88e1709d/jaybird_x4_wireless_in-ear_sport_headphones_black_metallic_glacier_review.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/building_and_engineering_contracts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d709945-a5b6-4d6d-a2c2-4672716a43e5/whats_another_word_for_sunshine.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/susekereb.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/42967434304.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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5460 bytes
SHA-256: 8a1bb09ae8c578d583988e2c0bac47ae9fba7f466f009b399bddcc990fb3caf6
font_01_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 12560 bytes
SHA-256: 98e6e4a10309a67721447da67fb8db0b174e307725f93e350ba6f9cbcd7e9ccc

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