Malicious PDF — malware analysis report

Static analysis result for SHA-256 db459eb7016141e2…

MALICIOUS

PDF

81.7 KB Created: 2021-02-28 11:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 462bd76338736b873d258b80055689c0 SHA-1: 4c34ddc3b4b68e04dbb7132c04c80857cd2f20ac SHA-256: db459eb7016141e27ed01380add1e7d625151b57270983800758ee69c0f4ee26
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'mezovuduw.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to Casio watches, likely a lure to direct users to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=how+do+casio+solar+powered+watches+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374364/normal_6026231587173.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/aVujfgi/note_s20_edge_lighting_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370780/normal_5fc96b7959f87.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/ijHjhLN/cross_wallpaper_for_iphone.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/1671548.pdfIn PDF document text
    • http://bestcreditcheck.info/best_formal_dress_stores4nf3v.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/ifMbhgg/movies_2019_list_in_theaters.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/Jif1jdZ/mastercrafters_clocks_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_600a9ad8cdb5d.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/kifagurelegex36ee.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/2fhfsQm/master_thief_sparr_games.pdfIn PDF document text
    • http://salonhq.xyz/47896979894yjvq2.pdfIn PDF document text
    • http://7lessons.fun/scag_tiger_cat_2_48_for_salew5u9v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5fca8765ae65f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajezife/manualidades_con_papel_de_colores.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/nothing_can_change_the_shape_of_things_to_come_movie.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 4960 bytes
SHA-256: 92ba9d3b5a03aa90648fc03e482ac543f63a6ad9631ace810bd524e1e59fa6b1
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 11492 bytes
SHA-256: 62b30e6014bd9bca4802d6d1ec67afee4ead912c5f320ee0209a23db4f98c1a2
font_02_sfnt_off00012b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B78 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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