Malicious PDF — malware analysis report

Static analysis result for SHA-256 b515a4a12a2d08da…

MALICIOUS

PDF

73.0 KB Created: 2021-03-21 08:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd4670f81d7b1cbe4b43d8f946170d35 SHA-1: e768be42d9f3e3f5cfbaa7bca41a456cea43e4fc SHA-256: b515a4a12a2d08da8d23d461205decd9371a555eff40040ff98a4c97d51e8c75
126 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=debt+snowball+sheet+printable PDF link annotation
    • http://soldonlakewood.com/anomaly_movie_2014_freebq39q.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/bozax.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/general_chemistry_atomic_structure.pdfIn PDF document text
    • http://complerbnp.com/abeo_pure_performance_sockscgmx3.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/ctet_syllabus_in_telugu_download.pdfIn PDF document text
    • http://goodnatural.space/797887652183kcn2.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/wufonejupirufekusulez.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/49682252314.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/caroling_caroling_burt.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/58147698372.pdfIn PDF document text
    • http://xbet1.fun/foundation_stage_maths_worksheetstr660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibizuladode.onlinewebshop.net/base_ten_blocks_worksheets_3rd_grade.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/wofakakisuvaravorobivazo.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/25024041330.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_547b88f8a1fc446f9b4f141ac8001cb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/bunsen_burner_and_glassware_safety_answers.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/geselabuvovegaduji.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/worodukagutik.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/goxironajudupasozapege.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/ligog.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/agile_project_management_with_scrum_ebook_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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5140 bytes
SHA-256: 625bb668051539e3eb7eaabb803cf398ef304c79e9a8529be6a399d42ab3b2fe
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 11012 bytes
SHA-256: 7279723ea6a8ac3eb1e95d9319f83241676eb69c255e528602695c86d4428fdf

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