Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd6733fedc7d7b2…

MALICIOUS

PDF

89.2 KB Created: 2021-03-19 16:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7decca88acf4901acf58b267032c4859 SHA-1: 2e8a0b9b5696c328b09c43c4a3272c4e8d39b481 SHA-256: 5cd6733fedc7d7b21343d0ceec1b50585cda1bb901e441124c09c35883771626
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious strongly indicates a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying a pattern of disposable hosting and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/wix?keyword=iphone+4+users+manual+download PDF link annotation
    • https://cdn.sqhk.co/tiwefuxab/C5zjaT8/amazon_echo_dot_3rd_generation_review.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/linux_system_administrator_interview_questions.pdfIn PDF document text
    • http://jushq.pro/gixumosomoau9un.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/jeyiji8/piano_magic_tiles_apk_download.pdfIn PDF document text
    • http://indital.fun/81585214592l80mv.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/igjfidc/bloons_td_battles_5_free_download.pdfIn PDF document text
    • http://verifybadgesbusiness.com/guboweokyiw.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/duwogumubuwuvitapisamegut.pdfIn PDF document text
    • http://ilkertr.shop/10293241042ib024.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/pumetinuvuzedotodet.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/oZehioL/moxaxepifikuwa.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/85721377213.pdfIn PDF document text
    • http://how2clever.com/que_es_un_pronombre_relativo_en_frances7gwqr.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/e3jhv2F/pinout_arduino_nano_every.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99ffbbf-e8ae-4620-b518-0f2de81f4fd6/powoluvibur.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/66980594024.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/the_sane_society_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71e61a2-2089-47bc-bb05-ba92cbc0e4ff/is_mercedes_c300_expensive_to_maintain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a516583e-b4df-439e-ba1a-2b5f3e6720c5/thank_god_for_new_job_quotes.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/economics_of_development_perkins_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920beeef-a205-435b-949b-a364173d05ea/self_confidence_test_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d921027-9801-428a-852a-ce08fd8fc3e5/facebook_help_desk_number_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ef63e3-3900-4b0a-b603-43d0b4db657a/download_adobe_premiere_pro_2020_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4cdbd3-71d1-4184-9959-1099c673cf0c/7716628991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87021266-ab3e-4129-8e43-bb2a44bf2593/nidurigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae207e9-1154-408e-a0da-3d672f39227b/3742235095.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/28665513314.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_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 5316 bytes
SHA-256: e26fbe7315768be7313dabf621c1d3b345ab2e607f85019c38b7151ae5acf609
font_01_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 12232 bytes
SHA-256: a0840c277564ae4b543bcf5f4b08cc0ff812b2a452aea8b20597a6b784c2df3a