Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de9344cca15c508…

MALICIOUS

PDF

79.1 KB Created: 2021-04-05 23:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 45905c41c10ed2ea311531749fafc371 SHA-1: cc2a873011341aa3467dc483327dc73c5d51749a SHA-256: 5de9344cca15c50811661ded421fbd1b34c5e98e76c4c0d46ab10add76c37cdb
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains or known malicious redirectors. The heuristic firings indicate it is a link farm designed to direct users to potentially harmful content, as confirmed by ClamAV detection as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be directing users to external, potentially malicious, websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/123?utm_term=constraint+layout+android+guideline In PDF document text
    • http://papawugamajube.mygamesonline.org/duluweroketuboxem.pdfIn PDF document text
    • https://rejezulibege.weebly.com/uploads/1/3/4/0/134018585/a4c0754.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/math_in_focus_grade_3_workbook.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/sigmund_freud_theory_of_personality_development.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/94307913178.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/wijajotogosezimuli.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/vurasepukutanagetamagoxi.pdfIn PDF document text
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/2152960.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/dikipixifulilojuvazegup.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/define_debit_card.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_51e0fa800a134a61848176e6da92f001.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_a5a1d1a9a10e44cd827fa372692e12ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8afddbe1-7fae-4b63-bba3-974078758f41/crusader_kings_2_console_commands_win_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c346d48d-3c09-43c6-9032-886616d31be2/can_imax_b6_charge_car_battery.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/triple_arthrodesis_surgical_technique.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_ac8cc0e395a949188db3cafe1fd30b5c.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_a3d4b35b834c414eaed114d5fe9ebbbc.pdf?index=trueIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_bb95b137ec55424da69fbfa885710fb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ecf8f3-fb34-46ad-a60e-ce7edd65ade5/81191116685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ddecd7-5010-44cb-b352-48da2e5dff89/how_much_is_a_used_2019_toyota_camry.pdfIn PDF document text
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_db69271710044838a99e19940ec5991e.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_3cc70aa776ea413a91b7bcd6d98a699c.pdf?index=trueIn PDF document text
    • http://visunes.myartsonline.com/fawabageladenibetapiz.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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5000 bytes
SHA-256: ec5b71b860f0e664f86f36228380e80b7393d7220b898e622b5139c96570d4cf
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11344 bytes
SHA-256: 70b1726ff5c5d41c78115dd80b3daf25b1d593481cc5eb4d1487b8b60eb83d01