Malicious PDF — malware analysis report

Static analysis result for SHA-256 059b55a8e7af9002…

MALICIOUS

PDF

85.2 KB Created: 2021-03-18 02:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 85bd2c8cc525a903e94436f8457f0e5d SHA-1: 19669d33fc6571338c93daeb6bf03288ef566cca SHA-256: 059b55a8e7af9002b188e662448cdcd38db313131b4176629bc7e737ecf2d661
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to dafemum.ru. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the redirector link indicate the file's purpose is to lure users to a malicious site, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/award?keyword=gejala+klinis+bronkitis+akut+pdf In PDF document text
    • http://usechambre.xyz/126029939236mnfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602899d3baf72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380694/normal_5ffc2f151c8a2.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/selaxenefagej.pdfIn PDF document text
    • http://bossyonlinex.com/la_valse_damlie_piano_partitionsgvga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_601afcb393f3b.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/zosukewepojokutulopiwovol.pdfIn PDF document text
    • http://useplafond.xyz/lusijukotexususiqpx3n.pdfIn PDF document text
    • http://pasendapp.online/honda_2600_psi_pressure_washer_partsa04rp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_602aee768dfbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_480799dfd6e54624b98f41d2d0ed978a.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_a0fbfb8e342b461880cf05a0016124bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fexuror/att._net_mail_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/answer_for_impossible_quiz_number_56.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_3f507d2357e140c4862050b7f85b4499.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/vugipozumonepekosavomosoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/tovarunajimonedegi.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/audacity_svenska_gratis.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_f94de49ef7a74cbbb87565159fc8eaab.pdf?index=trueIn 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_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 5348 bytes
SHA-256: 759056801981b00dee54054b0f8f58414bcae8db64f4088281daa76073a1bd9b
font_01_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 10660 bytes
SHA-256: e6539379d613b67c7b37f6cbea322ec7394f7d90831e8ae5c503af57b5c25c1b

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