Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef920e97b4f4ea4a…

MALICIOUS

PDF

84.0 KB Created: 2021-04-26 13:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07e12af0f12e61a1f500e0981ed42c91 SHA-1: 5a7825b16e6f9e8102677729cdfaeef03659d8d0 SHA-256: ef920e97b4f4ea4aade07ad0bd673212500a826947e620564231fd9d5f1f69a8
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 0.9990

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://gimoguvi.ru/strik?utm_term=pdf+tu+puedes+sanar+tu+vida+louise+l+hay PDF link annotation
    • https://cdn.sqhk.co/suvotoruwot/aijOLhi/5_freeway_closure_california.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ibqLSjj/76934210873.pdfIn PDF document text
    • http://dololebajug.scienceontheweb.net/dowuguxubafizogusefiz.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jjQhcih/twisted_root_mansfield.pdfIn PDF document text
    • https://cdn.sqhk.co/sirigibi/BiaNGhg/email_formal_letter_format.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/idDvjbB/vogufabi.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/16480721880.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/bea956a7-8fd9-4390-a879-375d77d6c7e3/1996_yamaha_kodiak_400_oil_change_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599534e8-96a0-43f3-82c3-0b0ee49d441a/xedunuwisopudopasedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692e9895-091d-4092-a84d-a53686187b50/what_is_the_most_accurate_.22_bolt_action_rifle.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/11633977968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0463e3c-39f7-4109-8e74-1ab338d86239/11234691459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338ae649-0bd2-4116-bb6f-fd317d064c2d/is_the_scorch_trials_on_hulu.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/company_resignation_letter_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/35594396936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63df1a8-bad2-43d3-abc1-f4d4f4ecc1d3/is_there_the_selection_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b3e64b-eb26-4295-a6f8-adb5cfab86c6/cuales_criterios_orientan_la_educacion_en_mexico.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_27b2792b02d9443fb32b20ca091824fa.pdf?index=trueIn PDF document text
    • http://fepetixapokurob.myartsonline.com/92944038097.pdfIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_6f5fc8a17574474396aac2ccbce34f3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f603e8a8-663d-4a4d-bbb0-d90f04c23a19/the_yearling_restaurant_and_lodge.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/timutugukivafide.pdfIn PDF document text
    • http://vekamodadon.onlinewebshop.net/icao_annex_18_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/29494895896.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_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 5292 bytes
SHA-256: 411e8d6c6aaf4e535ef6a02b699783f39b9900e1959e7fcf8b3ae5522e01a1a0
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 1596 bytes
SHA-256: e80d19f9f3f4c31a7d9518ca1a1cba1f35fe906d77e6bb57fb947f89c2d262bc
font_02_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 12380 bytes
SHA-256: 6980f750096f496684053044b0d3f6f6111ba0d8d19ea4da14e42eac5af4a17a