Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7cfdc4e5c8653e…

MALICIOUS

PDF

65.3 KB Created: 2020-12-23 13:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1258b8221098bae56945ae3d7c84cccf SHA-1: c01bd1e26aef45a69ed7e8a557a23e16a128a8f8 SHA-256: ca7cfdc4e5c8653efb31bf2082625e272cdb8832563f754293ef77e84acba865
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to a suspicious domain, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/123?utm_term=lista+cualidades+humanas PDF link annotation
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/xidubewulu_bodeziwosawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_5fd66e56db2bb.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/gupuso/advanced_english_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ff222d-93ed-4c03-854c-0bd783d6cadb/maria_woodworth_etter_frozen.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/58434409900.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/watch_detective_pikachu_online_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184f0c7d-03d8-4054-b401-c63c4c4ccb98/yokai_attitude_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/nunexaxiloj.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/bogoroditse_devo_rachmaninoff_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20627478-1cf7-438e-849d-37fa97fc0ff5/6158033051.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/indian_bodybuilder_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/bobina_de_tesla_proyecto.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/vidmate_mod_apk_install.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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 5024 bytes
SHA-256: b977d894651b5eba942ba023294b19c845df53d38970dceff1ef222932911713
font_01_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 10780 bytes
SHA-256: bcd3a961c6803f39ac60349c6b8c7daeded8774e6ea1708e1d8f8534219187a5

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