Malicious PDF — malware analysis report

Static analysis result for SHA-256 8624a3b2e1aef6b3…

MALICIOUS

PDF

76.7 KB Created: 2021-01-13 19:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4f2d33a84606b36c7cd442c46e2457df SHA-1: cf47d8f333171c74c24162ccb6f4c637a659763c SHA-256: 8624a3b2e1aef6b388dc2f14d5cd23d0c07bfec47b74e4f7cdaf76ef964c8773
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/aws?utm_term=text-+transform+capitalize+bootstrap+class PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f8c95a9dc0da.pdfIn PDF document text
    • https://site-1178468.mozfiles.com/files/1178468/best_worms_let_s_play.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fdc3710c3b2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420775/normal_5ff7ab3815ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fd911af58686.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/bamaxowifidowubipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffd0d948934e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5fe5dd9219647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_5fbc3b5c5946d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fbaed646ade6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416136/normal_5fc4ada1280b1.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/genijusemu/brawl_stars_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/nattamai_movie_hd_single_part.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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 5400 bytes
SHA-256: 78bf308a5b85ac05417ad5765c16890626f25977ac3d14a27bf9359419457de8
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 11968 bytes
SHA-256: 997c7471f70bb85860787d6f7a277c1ab0db419f14ed80a37726d5cef1c6b5df

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