Malicious PDF — malware analysis report

Static analysis result for SHA-256 680c60f0e580b8b8…

MALICIOUS

PDF

71.9 KB Created: 2021-03-11 13:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8477991ed1341e45d5f0bfee9a0369c9 SHA-1: 9b23a467dcad796c28c7a203e4e6f263505c01f6 SHA-256: 680c60f0e580b8b8223f8aa243144c9c6ed89c59a6d345bfd13f6b4d1bac4ff2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/award?keyword=because+of+winn+dixie+vocabulary+pdf PDF link annotation
    • https://cdn.sqhk.co/fakineduxafe/hhchdFG/84035471964.pdfIn PDF document text
    • http://dafilor.iblogger.org/61020009084.pdfIn PDF document text
    • http://laxetatisitu.iblogger.org/28427315655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ff34752bd83b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_6049cb5acca33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fd2f93f41250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6023fe723f6b1.pdfIn PDF document text
    • https://cdn.sqhk.co/tadeketoxab/LjaibbW/sago_mini_music_box_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_602efe1bab378.pdfIn PDF document text
    • https://cdn.sqhk.co/zapakolozu/ihjwHAg/yellow_book_cpe_webinars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_02757bdb90f742e691c88d0478f9806a.pdf?index=trueIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_3bd6d9d4148244cdb53cdab9b9808d4e.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_579746c49106407d803ceea97c71d897.pdf?index=trueIn PDF document text
    • http://lozulunadiko.epizy.com/conducta_social_asocial_parasocial_y_antisocial.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_5ef85e03767a40d7aac468e4972e21c8.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_5d1941a95fe5475b969c1f6f5d5b6f78.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_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5660 bytes
SHA-256: b30c81f0b8d599837750e6bebe7f178ae69d339aa0e18e30d07642d6811cfd1f
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10468 bytes
SHA-256: 063889a3fdaf7492bdd33538d78beaab82e6e5a6229761a50b8cbd5a5acd1006

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