Malicious PDF — malware analysis report

Static analysis result for SHA-256 991a50ca4083b6b2…

MALICIOUS

PDF

74.2 KB Created: 2021-03-09 21:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b2f3e4a4715acb9b61c9c82046d5c4 SHA-1: 586b5d33da1e77e025f230d91c4a0b9751ad7ee1 SHA-256: 991a50ca4083b6b222539374e0759e5f2d8461e8a0cb1c1e9ea0289bcbb0dbfc
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to relate to the URI's theme of ebook conversion, suggesting a phishing or malware delivery lure. No scripts were extracted, but the presence of an external URI strongly indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=using+calibre+to+convert+kindle+to+pdf
    • http://bitoxifa.sportsontheweb.net/2_timothy_3_1-5_bible_study.pdf
    • http://zupurowuzuxule.iblogger.org/bonutusos.pdf
    • http://riwotivadejud.sportsontheweb.net/jiduzitixulivipiriki.pdf
    • http://wobafobigo.mywebcommunity.org/criminal_law_textbook_nsw.pdf
    • http://lipazegeboludep.sportsontheweb.net/47686689035.pdf
    • http://xodaxedepapopox.mygamesonline.org/bajadovew.pdf
    • https://static.s123-cdn-static.com/uploads/4381528/normal_60020d85b0c92.pdf
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5ff42180a018f.pdf
    • http://vevufilusik.scienceontheweb.net/xezujajat.pdf
    • https://cdn.sqhk.co/duvapegoleva/00RUUpj/dinosaur_world_cave_city_ky_coupons.pdf
    • https://cdn.sqhk.co/raserijene/BVicieR/outdoor_tabletop_electric_fireplace.pdf
    • http://daludaja.getenjoyment.net/gofumiju.pdf
    • https://cdn-cms.f-static.net/uploads/4446377/normal_601c60c6a058b.pdf
    • https://static.s123-cdn-static.com/uploads/4379610/normal_5fcb607b65940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dazewedoxagaxaz.epizy.com/jurumadixifilipezil.pdf
    • http://suvalomimo.atwebpages.com/64856862389.pdf
    • http://dapekafuxururo.myartsonline.com/libro_de_interpretacion_de_los_sueos_cristianos.pdf
    • http://zapusov.atwebpages.com/gutemoludo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e551.bin
773cb2cdb1ebed64885108e93d87e4cae207f19deddf9451fbdd0a5161be9f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 5580 bytes
font_01_sfnt_off0000f85f.bin
6e8bbd5d0ac42bb4713c0912a83a17d85d07a87329f958a666c3eb89b451e617		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 10308 bytes

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