Malicious PDF — malware analysis report

Static analysis result for SHA-256 af84c79491c404f3…

MALICIOUS

PDF

81.8 KB Created: 2021-03-07 19:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0cfb05f12c5e520f8e2024691ba733eb SHA-1: d44933352c1ff61163145e260e3b3ab74660a08a SHA-256: af84c79491c404f3bad449af04dac65c071ca3538731644f702b19c4d401a5b6
174 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of external URIs and a link farm on disposable hosting suggests a malicious intent to redirect users to potentially harmful content. The document also contains instructions to disable security software, a common tactic in phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=removewat+download+win+7 PDF link annotation
    • http://folejaf.mypressonline.com/jerigebuzuriloguze.pdfIn PDF document text
    • http://agentsecure.space/94675332323l8l5n.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/30073236074.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/whjqo2n/amtrak_police_jobs_chicago.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/dizulepozotadam.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/90SLEgh/elite_mobile_pet_services.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/org_chart_template_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/hhpowBD/gin_rummy_plus_free_online_card_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/hhhFPie/university_of_montana_bozeman_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/Wahe0HY/fovibopi.pdfIn PDF document text
    • http://legalvictory.group/43616535775eeo7y.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/samsung_smart_tv_50_inch_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6XXhgdL/konemikoxubor.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/deca1900-9ad8-4db1-86ef-86636336ecb4/how_to_do_backwash_filter.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/business_ethics_and_corporate_social_responsibility_articles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b6d2dd-2f6f-46c7-b9c0-eabb9274a3cc/82667728848.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/20518585349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486a6c9f-99a2-477f-9dfc-3933eeb6cc50/super_mario_64_bob_omb_battlefield_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2154a15-04b7-4134-b27d-fe718b53911b/photoshop_tutorial_bangla_book.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/the_chronicles_of_narnia_books_1-7_free_download.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://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 4936 bytes
SHA-256: 580427c52cb39b414c1089737f5278382aa55bf834b171bef509c0e8dc1fa74b
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 10532 bytes
SHA-256: 92210ac54f6727e7490700a2d38e99743dfd412976256964a754ac24abb584df