Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fa2c43f3ae6edc…

MALICIOUS

PDF

81.0 KB Created: 2021-03-15 10:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1242df2b15ea556d35412d298ac625fc SHA-1: bb4abfe17c212535f694df775b4ff9a284d15a75 SHA-256: 88fa2c43f3ae6edc4e94eb7b9553314cf8476a277a6fd11ce326f94b354c9643
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://baarspo.ru/award?keyword=artrosis+de+hombro+tratamiento+fisioterapeutico+pdf PDF link annotation
    • http://fepenikozi.22web.org/115321268.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/N8iisB5/96831687219.pdfIn PDF document text
    • http://7lessons.website/how_to_disable_alarm_on_onn_clock_radiol3og4.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/soveridovidexumogirat.pdfIn PDF document text
    • http://getveran.site/piwur5q25u.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/agfWjc1/48948708278.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/MBgg2ij/nirubonaxebirepilezakap.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/hcHhjzj/tawil.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/ieO97hf/wobaviwejaje.pdfIn PDF document text
    • http://jadebey-x.com/96175385896gctpx.pdfIn PDF document text
    • http://everydays.space/how_much_are_fender_online_guitar_lessonsak8yx.pdfIn PDF document text
    • http://legko.travel/97149555191pjsu6.pdfIn PDF document text
    • http://alkostore.xyz/how_to_reset_brother_hl-l2360dws911v.pdfIn PDF document text
    • http://igcopyrightverify.com/nagugolumimabamipogawivk1j27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomirunorejuso.epizy.com/roxadumine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3c00e9-1f44-42e0-94cf-bcbd0aaf6905/vertex_factored_and_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0530dc85-5fbf-4b97-9991-033d912c0f31/how_to_edit_vertical_video_imovie_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e78281-455d-4ce7-b52a-3ff438423efd/52963634109.pdfIn PDF document text
    • http://zitejilid.epizy.com/nucleon_kota_video_lectures_free.pdfIn PDF document text
    • http://duposul.epizy.com/chemical_oceanography_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2d402b-19a5-4531-8050-fd51997cc30d/75630235403.pdfIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_04396644610a436e98982bbb8aa834bb.pdf?index=trueIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_c289b3bbb9454eefafec70cfbbce9cd4.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_11a88e4ff5b047d084c4339a0b5904e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ea5fa2-3206-4721-be67-fbf646a51b85/fitbit_flex_1_charging.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_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 5492 bytes
SHA-256: 24e637bfd6cf821d48ed7ccac4cd7c6682687355e76f2501f41d70a47e70e573
font_01_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 11208 bytes
SHA-256: 11506864b55afa22dcb2d22c0c9ad878f99b2ac14a0966f3caf16ddad7f999b3

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