Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b9ede5dff0fa40…

MALICIOUS

PDF

72.2 KB Created: 2021-02-15 21:25:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5dc3b6bae8121f0c5dfd3e9ed051e56a SHA-1: 904da5869d064c93b2c408a6e75eb15f619aa3c5 SHA-256: 10b9ede5dff0fa401b94b4bab292b5042a6309aefe0db44f592002a4b61efcf1
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-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://leonvi.ru/strik?utm_term=howard+miller+grandfather+clock+value PDF link annotation
    • https://cdn.sqhk.co/xosifusozat/cHGqgge/hindu_religion_apps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_6010c5aef2dd4.pdfIn PDF document text
    • https://zojunakalej.weebly.com/uploads/1/3/2/6/132682915/83a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5fe8e89765235.pdfIn PDF document text
    • http://rivuxini.66ghz.com/blackfoot_river_outfitters_fishing_report.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/ginizidiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5fcef894b27bd.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/ibe9Ogi/shadow_adventure_dx.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/mPDfzjd/lighthouse_pizza_stratford_ct.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_6019357d3ca8d.pdfIn PDF document text
    • https://gebiralegesexi.weebly.com/uploads/1/3/0/8/130814020/cd13cec5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogefotatuledis.epizy.com/tefokobivipa.pdfIn PDF document text
    • http://ladakafojovawa.epizy.com/student_attendance_management_system_project_free.pdfIn PDF document text
    • http://lulanikigog.epizy.com/he_doesn_t_answer_my_questions_directly.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bailaras_movie_songs.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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 5436 bytes
SHA-256: 025d597dfd7c6cc6dacc3b072356ebf9487351184cd3de56881ab3946f329c17
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10800 bytes
SHA-256: eb994b010aa8e7c0204324ceefdf2ef5ece7503fde0e88b0637c9465a014e8b8

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