Malicious PDF — malware analysis report

Static analysis result for SHA-256 647fa234c6f83cad…

MALICIOUS

PDF

71.3 KB Created: 2021-02-26 19:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b39933894f802f0991e8f7520b777d0 SHA-1: 040250d10fc9813afbe82904ba4649620049bb3b SHA-256: 647fa234c6f83cad3af59ca1cd53097b051aa2ec70803939b2c0788bf092d7dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'Partes de motores de corriente continua' and application metadata, which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=partes+de+motores+de+corriente+continua PDF link annotation
    • https://cdn.sqhk.co/petawelesup/fxtfaic/pokolebokor.pdfIn PDF document text
    • https://cdn.sqhk.co/bubesuzax/hj8OU1v/19749931154.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/a7hgijU/anti_submarine_warfare_officer.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/ijjS44H/truck_wallpaper_free_download_anime.pdfIn PDF document text
    • http://tumbaa.space/jinenuxojopoxezaszxa9x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408864/normal_5fed53775a377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_600e114c64e41.pdfIn PDF document text
    • http://nibumuxadata.66ghz.com/what_is_the_main_message_of_the_book_of_romans.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/hcDUwnh/83778147994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapulikilep.epizy.com/29165217589.pdfIn PDF document text
    • http://titomozuluvexov.epizy.com/buvonuvisigik.pdfIn PDF document text
    • http://gegiratafalor.epizy.com/epson_artisan_1430_ink_cartridges_cannot_be_recognized.pdfIn PDF document text
    • http://bafasoronejero.epizy.com/lagu_ost_cinta_karena_cinta_uyeshare.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/what_is_faith_fords_net_worth.pdfIn PDF document text
    • http://dumurosaderured.rf.gd/81953404242.pdfIn PDF document text
    • http://wuparol.epizy.com/phpspreadsheet_add_border.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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 5056 bytes
SHA-256: d13b30312d7fe3941d17d1ac992c14e9455cbcac0ac9d8809b2c92f34fead255
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 10556 bytes
SHA-256: 679aa8d8cc43b765bd12a6704ad8320fccb223f5cb2e6fbe6a2ad1b5f859abb5

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