Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df71c7ae864e1b4…

MALICIOUS

PDF

78.1 KB Created: 2021-05-03 22:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b70a811a1c96dc1b4c9c79a455e22c62 SHA-1: 35d5173406f17a53b2bfa85ba5900a7a7f340baf SHA-256: 8df71c7ae864e1b4f2a28e2c82f44cb5fb84db8eb0ca28bd07d7270a312ef365
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://baarspo.ru/strik?utm_term=how+to+service+a+new+holland+tractor PDF link annotation
    • https://cdn.sqhk.co/xugumewaz/hKoah65/kikkerland_moustache_clock.pdfIn PDF document text
    • http://olymp-trade.top/html5_textarea_required6x9dx.pdfIn PDF document text
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/8217864.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/heIChdF/brain_test_tricky_puzzles_level_101.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/bacterias_coliformes_totales.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/pdf_file_reader_download_for_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/bYceheC/free_pancake_colouring_pages.pdfIn PDF document text
    • http://kasyanbeauty.com/65749959822c1tcn.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/garmin_nuvi_3597lm_price.pdfIn PDF document text
    • http://toreret.scienceontheweb.net/political_economy_of_the_middle_east_richards_and_waterbury.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/efeb72ed1838.pdfIn PDF document text
    • http://love-cosmetics.shop/fetuwawanexktyxo.pdfIn PDF document text
    • https://cdn.sqhk.co/gizafimode/jjepQja/freeze_pipe_bong_review.pdfIn PDF document text
    • https://talusisepekixed.weebly.com/uploads/1/3/4/0/134012470/musepupirutu_lutemu_dabawosuf.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/84677526013.pdfIn PDF document text
    • https://cdn.sqhk.co/fipakebeb/ijfhgUL/42044392584.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/kananelunovijori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazixipame/86427818807.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/68228932897.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/14058855910.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/android_intel_x86_devices.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/tutetapijimon.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5140 bytes
SHA-256: c051bfcb81d04ae9713aa7289b5538d76804b0ae3110bb900ee84e80dc56111b
font_01_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 11156 bytes
SHA-256: 24c2f96a25e686f18cbc4c175305807158c563500606e8dbf1d7a98f6fcd90f1

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