Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28f0c5363792480…

MALICIOUS

PDF

75.4 KB Created: 2021-06-06 07:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f2dc1bd808a686fafbbb5007f4747e8 SHA-1: ad2b6a9eec8dbe8b714123d80a1c4bad55406327 SHA-256: a28f0c5363792480cfecd2dffe0dc9f2e0c18b56d7829191d06b4637080f0cde
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://cructi.ru/pbw?utm_term=descargar+neo+geo+cup+%252798+the+road+to+the+victory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500208/normal_60bb862e3fd7f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4414871/normal_60b02386559a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ff5a2787ad0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_601d19bc9b9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_60312d31d7dad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_603ce0c5eb51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_601cab8d79a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_60675b14bc78e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458856/normal_5ff21541ad624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fd183e8db92d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_5feb57ac5671b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biduzoku.pbworks.com/f/nunodadora.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144415719/descargar_gta_sa_para_android_lite.pdfIn PDF document text
    • http://momoruxoxim.pbworks.com/w/file/fetch/144626409/ariesms_leveling_guide_2019.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144607215/how_to_use_perspective_procreate.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144532419/developing_person_through_childhood_and_adolescence_eleventh_edition.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426786/how_long_does_a_piercing_take_to_heal_nose.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/pokemon_gba_games_on_switch.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/libro_rinoceronte_descargar.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144656307/41711445286.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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5848 bytes
SHA-256: 8cb724a7a963c5f5cdc38077f701b614b027448957fae953c702e300034eea8c
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 11960 bytes
SHA-256: 9530b97c8776fcdc108f89e9ff29f9f1a34b58589b59c2a8db4810f6f4eab70d

Open this report in the interactive analyzer, or submit your own file for analysis.