Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba155cfc707716d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 13:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a0a37f04021e90b6c5fabfaa8707585d SHA-1: 6714b18d014180092ae515e207bcd3c2b16f04d2 SHA-256: 3ba155cfc707716deb4f6976e5f5a17cf5f96525faf414e5b82581cdc3be5777
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/strik?utm_term=pete+the+cat+and+his+buttons+song PDF link annotation
    • http://saudiautoinsurance.com/63367447898qhqti.pdfIn PDF document text
    • http://hyipinvest.site/3769998381fqz7n.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/the_importance_of_being_earnest_film_online_free.pdfIn PDF document text
    • http://bonifacy.site/manually_activate_office_2010_cmdc0nly.pdfIn PDF document text
    • http://genoray.pro/sarezegemojzf6k5.pdfIn macro / runtime command snippet
    • http://katowad.22web.org/antonio_jose_de_sucre_biografia.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/financial_analyst_resume.pdfIn PDF document text
    • http://lalexejiwisejul.iblogger.org/hansel_and_gretel_2002_amazon.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/72850810192.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/3383280578.pdfIn PDF document text
    • http://pidawiwosoda.iblogger.org/marantz_pmd-300cp_dual_cassette_recorder_player_with_usb.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/c9a3e03d-0039-4f9d-afe3-8c0e784079c2/44300820495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cddc44a-b22c-4f61-b2ee-64ffc7a3eb48/66125687799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e090bc3d-4137-43f2-ba75-b63b023dbcf1/gilemetigipumopupamem.pdfIn PDF document text
    • http://zaravugudag.rf.gd/frozen_sheet_cake_images.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/c94925de-c5ef-41d2-9a5d-31e4766d5335/2006_chevrolet_malibu_ss.pdfIn PDF document text
    • http://zararogesa.epizy.com/bootstrap_4_form_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23ac4ad-2ccc-4f9c-82b5-7ad1a50052dd/w3schools_html_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193432ae-a0cb-438a-b204-d66078e9ae92/daily_maintenance_plan_template.pdfIn PDF document text
    • http://fabomisibis.rf.gd/toro_timecutter_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb67be3e-af0d-4ec0-9dc1-6f605ebfb168/91461992707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2738add-dc8e-4f21-9164-7f5f0abf77e3/what_can_charge_a_kindle_fire_cost.pdfIn PDF document text
    • http://relisedozoru.epizy.com/dazetofoxujuxezufisaj.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
    • https://uploads.strikinglycdn.com/files/e090bc3In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 5212 bytes
SHA-256: 2e49e880bb1c21a640c0c676650b54541b98882bef3c21e8089fb9cba68b7dab
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10988 bytes
SHA-256: caee7857633d220f250bca02a61b5cdd4b2b13fadfd8a4072a280165073cf839