Malicious PDF — malware analysis report

Static analysis result for SHA-256 1534f67123ceb26c…

MALICIOUS

PDF

78.2 KB Created: 2021-05-16 00:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e4875daf551ccf0a70120298ff7e29e4 SHA-1: 0a04648bf9f8720624a48064a3ee403eafcd9a9f SHA-256: 1534f67123ceb26c84840008171b82b3f9222c14248beeae23b95e638a2b6bca
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, with one pointing to 'https://xezojetit.ru/strik?utm_term=creative+writing+assignment+middle+school'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=creative+writing+assignment+middle+school PDF link annotation
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/ijc7ges/formula_1_racing_drivers_2020.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/st_alphonsa_biography.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/academic_word_list_with_meaning.pdfIn PDF document text
    • http://tubujefowabe.medianewsonline.com/us_army_apft_score_chart.pdfIn PDF document text
    • http://bapomiju.iblogger.org/buccal_space_infection.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/boxuwozikosex.pdfIn PDF document text
    • https://cdn.sqhk.co/rizinutix/2MTiihf/osm_scout_list_app_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a5b37f3a-fc5c-4e38-98f5-cd12077573da/volvo_penta_sx-m_outdrive_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f437150-666c-4160-b36c-4164da6cec56/vafanawav.pdfIn PDF document text
    • http://ximewilavabav.epizy.com/transformers_animated_prowl_and_lockdown_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ee06b9-2952-4c3f-b287-a7baba996401/23132791527.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/94591695273.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_95c440f51c1643b29b1c2babb23d10b8.pdf?index=trueIn PDF document text
    • http://gemawinikifiv.myartsonline.com/bernoulli_s_theorem_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e29cbd5-7706-48b6-a67c-c74dd5056414/how_to_start_a_microsoft_access_database.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_2771a3be2d9c4583a71032efd3920f27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20b8322-da35-47ba-bafb-027635ac8751/texepidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5316 bytes
SHA-256: d5e9ee9ef07a05b1b6dbfeb5cada4236e79962552c524c1a141aa2c2660dfa9a
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 10164 bytes
SHA-256: 908d095e3a44518232413e54f18398225b87e72f30bfe0c19fe11b36cdd7806b
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71