Malicious PDF — malware analysis report

Static analysis result for SHA-256 c479b79e33a17c57…

MALICIOUS

PDF

93.2 KB Created: 2021-04-06 19:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: becf398b6a660e42dbacd1477a082eba SHA-1: 176643558a68f18172cf66f35c46b19b3d845efb SHA-256: c479b79e33a17c57c5fa40fc3cb1dc1fcb19a5fe73de6c27829b4a04dc1e3ad8
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 0.9990

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://botokaw.ru/strik?utm_term=learn+chinese+in+5+minutes+must+read+aloud PDF link annotation
    • http://vuzeliligovitu.iblogger.org/42224801899.pdfIn PDF document text
    • http://negeduji.66ghz.com/61150894779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_60485dea34794.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/gAgeihs/76207752106.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/nhbmWhj/dovegod.pdfIn PDF document text
    • http://zolozabaxozafa.iblogger.org/carcassonne_big_box_english_rules.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5ff65a41829aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_600700b244cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fd9f50acb5a2.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/9iZhdxt/lenetatomubaximabem.pdfIn PDF document text
    • http://buvepanakupa.22web.org/paulo_coelho_libros_la_espia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fdd54e-0b6d-4b09-94ee-7d8c6b852151/lifub.pdfIn PDF document text
    • http://mifaropofim.epizy.com/brochure_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933f1115-b26d-4492-b1e2-7617ed030723/what_is_an_example_of_a_text_structure.pdfIn PDF document text
    • http://zanelexi.epizy.com/advanced_sorting_and_searching_algorithms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71997dde-8919-488f-aecc-d102585432c5/21313796163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec560212-8a2e-4efa-a060-899baa777840/jorogaz.pdfIn PDF document text
    • http://tedivepi.epizy.com/remavevidopovawamopoke.pdfIn PDF document text
    • http://duladujofivar.rf.gd/22261661090.pdfIn PDF document text
    • http://mufunalera.rf.gd/los_angeles_lakers_cap_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7249566-c617-4a53-b9a6-2134741855dc/pattern_oriented_software_architecture_volume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d8f19f-354b-4ed5-bc53-2ed29f1028b3/simple_guitar_notes_for_hindi_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64dc96d3-f3bf-4802-b656-f750758fa15b/what_is_narrative_research_question.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 4400 bytes
SHA-256: 32600ac991880b76b1cf8e3d6b62bdc87c8ef0f3610c5b1253555e3c2c5a8bf8
font_01_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 5244 bytes
SHA-256: 1c453b15995046216915ece1b0447960985c95959a3d2ac9d1766706ac072d25
font_02_sfnt_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 12340 bytes
SHA-256: b85dbbc73b4df6d125c8e536a9e98698769ca573b3da015db18abea68ac94f8b

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