Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf4c42e897ef2f8…

MALICIOUS

PDF

77.6 KB Created: 2021-01-13 15:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 18782c8917704c316dbb91e3ffb2d529 SHA-1: ff10ed456e2027d2fae1cfeef865fe2379ca6c88 SHA-256: 3cf4c42e897ef2f824a6c0e60c170268c2ada6eea18b6c5de8a6963456da907d
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating a phishing attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of embedded URLs and the heuristic for urgency lures suggest the document is designed to trick the user into clicking the malicious link, likely leading to further malware download or credential harvesting.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/aws?utm_term=nausea+vomiting+in+pregnancy+guidelines In PDF document text
    • https://cdn.sqhk.co/puburikob/WTgiiaE/83536737640.pdfIn PDF document text
    • https://cdn.sqhk.co/tilomulobet/RhYtmhb/1215042793.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/Cghjjid/killshot_movie_colson_death_date.pdfIn PDF document text
    • https://site-1177895.mozfiles.com/files/1177895/neo_geo_battle_coliseum_dreamcast_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/DhfWVmE/jewapoxalenavib.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/jYLuAgc/zevunalete.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/gjpRjbA/police_pursuit_live_now.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/fofofofimolel.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/mavixu/game_purble_place_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/jebuj.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/busqueda_avanzada_twitter_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/26505364556.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/raxasarapewofiso.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_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 5524 bytes
SHA-256: 05c962253d83564796e3cf1646b1c670ef51c5c2c77159c9caa7f422ba63df9b
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 10516 bytes
SHA-256: 2a1afda4a0580f1b47b98325eb7df8a223fb9f5350ef5889b36ce98d2c3790df

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