Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffcfa46d7de6873…

MALICIOUS

PDF

116.6 KB Created: 2021-03-15 07:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b0df4713d1375f0484ab6919706b906 SHA-1: 1147dd38e0aa408b462068c925a82ad8f80844e5 SHA-256: 4ffcfa46d7de6873b33e4e03b15b60e4a2396d63329f68752ffd8a2009688f4f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=pages+in+series+of+unfortunate+events PDF link annotation
    • https://cdn.sqhk.co/litonesi/PQjdkgc/51431554051.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/cN6Liem/11232708088.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/3hbzfhe/sounds_like_war_letra.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/NjbwFhh/drop_it_modern_azteca.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/2312739.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/d66aa36b75f.pdfIn PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/sanavadetonur-tutinuj-kerinogidor-mepaxanujup.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/clbjc84/54709593693.pdfIn PDF document text
    • http://loletopuwiv.iblogger.org/report_rai_3_juventus_streaming.pdfIn PDF document text
    • https://wigotimobegevuj.weebly.com/uploads/1/3/4/3/134312632/7401778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogobafepuk.epizy.com/translate_spanish_to_english_document.pdfIn PDF document text
    • http://ganemezokefesuv.epizy.com/anita_desai_village_by_the_sea.pdfIn PDF document text
    • http://rawobebisef.epizy.com/how_to_use_hand_pallet_truck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce739da0-0401-4a70-b9c3-8c4f84672059/21190582596.pdfIn PDF document text
    • http://rijujala.epizy.com/draw_so_cute_calendar_2019_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e443cf8d-084b-4289-bb35-32a8443406d9/xugalav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0372e4f-ad0d-4dae-82c8-82d3b8944ec0/what_to_do_to_buying_mutual_funds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca4a753-e76f-46c5-b7c1-6ad0ef1eb07b/hands-on_machine_learning_for_algorithmic_trading_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c9831f-ebb9-4efd-a108-bdeef3b706fd/70310421240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e1225f-eef0-4c03-b93c-bf88b922f314/famous_persuasive_essays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224ea80c-2f95-4d8d-a367-9661aca0eb22/letter_from_birmingham_jail_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6928abb-e74f-43e5-83b4-9e35e4f7db93/which_is_best_home_equity_loan_or_refinance.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_off00018c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C29 4964 bytes
SHA-256: 9bb9cbfe27547f38b95820eada3686862f308067a2b1bb51e90e6e7bbf7ed73e
font_01_sfnt_off00019d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D27 11948 bytes
SHA-256: 8029cd81f60f59301824f16987ee82ebe4f83596a755b1e3e24143fc5be5d16e