Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb38a02c28f1f705…

MALICIOUS

PDF

76.9 KB Created: 2021-02-09 01:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10324b6ce41b6810d3f847ec7bb6ba9e SHA-1: cd9facc9917420d47d653c415a79c1ac410359a3 SHA-256: fb38a02c28f1f70559069658ec0f65756c5c0cb32aeaa0c2703cc4fa6dc5f561
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 'https://crophysi.ru/wb?keyword=materialismo%20contemporaneo%20pdf'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wb?keyword=materialismo%20contemporaneo%20pdf In PDF document text
    • https://cdn.sqhk.co/wefonasifaza/gjEhcha/46103580647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488815/normal_5ff8d783888b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5febfe4ae31ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6017156ed87c3.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/e8gg6UR/phoenix_suns_players_all_time.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/0m0jiji/nigezesiboxexijafidugi.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/hbvXgek/talking_angela_hacker_kidnapping.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_601bd4c947e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5ff8ff2fba8bc.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/hfoK9ig/best_pill_reminder_with_voice_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_5fd7f99920a06.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/lopadivupudexa/anime_wallpaper_4k_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/google_sign_in_android_example.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/fopejepu.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/pojuvunowiseb.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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 5304 bytes
SHA-256: 57b484cdd8dabddcd58bfd092b8464d8f90cca75b91ccc565e0ce4f2da9b1ae3
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 11236 bytes
SHA-256: 600ebe4d69183b6670dd189d20b81d4d47faa0917d9a582d1e8417bafddb4104

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