Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33672890ab07bdd…

MALICIOUS

PDF

77.0 KB Created: 2021-06-08 04:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a02be68c6e2a7c33caecb3fcb1470a4 SHA-1: 511048d3e2d77150fe60602ddbd1af3e9d4f76fe SHA-256: d33672890ab07bdd633e0ed31ec8d2debb6cf5cfbd07b77f9ae03dba17d51d7f
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various platforms. This behavior is characteristic of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://archism.ru/pbw?utm_term=microsoft+excel+2016+tutorial+for+beginners+pdf PDF link annotation
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/d7c7de842c.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/jemobed_zidiluvuju.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/ee9e816d-1257-4dba-8489-70bf492a7114/cryptography_and_network_security_principles_and_practice_william_stallings_7th_edition_2017.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/w/file/fetch/144531759/gepiroguvefizaperokujazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406e4a80-ed0d-4ecf-8fb3-ab339a909778/manual_white_rodgers_thermostat_1f78.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/tesidemosirapijo.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144601875/breckwell_pellet_stove_parts_p24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9a3093-d797-408c-99f2-0aeb97883c9d/electric_mobility_scooter_repair_manual.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144564606/14204194464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3c49fe-3de8-4ae3-a744-a2a081c88198/can_you_vectorise_in_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5330d117-d9e0-433d-b4cb-0a07e6527608/wv_college_and_career_readiness_standards_science.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144626973/10177791259.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144452265/how_many_bearings_are_in_a_transmission.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144461943/electron_configuration_pogil_teks_6ei_answer_key.pdfIn PDF document text
    • http://namimutigete.pbworks.com/w/file/fetch/144749418/how_to_study_widal_test_report.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144731175/how_to_curse_in_roblox_without_tags.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/fisicoquimica_castellan_2da_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7357a6-cc68-4f45-ae76-1551ed1f7d78/28504307694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4149d0b-9f38-474b-abf7-59d19867b7be/55802266041.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411717/98229552470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef26c644-2dca-4e88-b46a-6a2636d35d1c/vibe_universal_remote_codes.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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 6016 bytes
SHA-256: b35de69bb7f0e18cd77529bcd02cd3267ffa282a24dd7e50ce59f973866a2fbe
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10912 bytes
SHA-256: 24bf51e066a0f21b96e7ce31aae404eaa24d86c317b5aaa49ed52f674a8e4dae