Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0f3006cc27f1e9…

MALICIOUS

PDF

75.8 KB Created: 2021-02-15 01:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cfe286e2b61c0407193600bac9a7a38d SHA-1: 584ec26455c8787905e21c876f4a507d91f6cba6 SHA-256: fc0f3006cc27f1e94b322b048d7d1f2c36f5af337c744b7ef898fdea0cd2e220
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 0.9997

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 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://druttle.ru/wix?keyword=warrior+cats+medicine+guide PDF link annotation
    • http://thrivewebs.com/barbie_doll_cake_photouim3q.pdfIn PDF document text
    • http://vizionsmc.net/kovujipamegari3lpzy.pdfIn PDF document text
    • http://razvivatel.blog/asset_management_process_flow5m3kq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_601cf8548749b.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/fidejofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fda7f6e29d9a.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/katevomo.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/haUYDFa/vuluxalosogufomodofubub.pdfIn PDF document text
    • http://bokulidedasez.22web.org/best_manual_can_opener_made_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jdMXhbV/word_of_the_day_list_for_preschoolers.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/dupula/5732211085.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/us_passport_renewal_form_in_person.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/rorojag.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 5240 bytes
SHA-256: 15f89b73b5154f6362880c6ceb807bc719160cad5dc528931c4bba4925120bfb
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10240 bytes
SHA-256: 58d5ca7e5e8bc314beeb13d1a8f2134212d09e7bb3e1953f7c196f48dc1001e5
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826

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