Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c95c81f5a5dc7b4…

MALICIOUS

PDF

81.8 KB Created: 2021-02-28 22:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7abdee992de2f38f58cd1e5ec128d1a5 SHA-1: 9e58a803f199459cf336aae7005eeac3867bddbf SHA-256: 7c95c81f5a5dc7b494155ebc4f8b2d52123c2e578f812c7de7e394d7e4d492bf
126 Risk Score

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 0.9998

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://maypoin.ru/123?utm_term=restaurante+don+juan+palermo+buenos+aires PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444115/normal_60352b2ceca96.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_to_pair_ue_boom_2_speakers_together.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_600ddfab79e81.pdfIn PDF document text
    • https://cdn.sqhk.co/buvoxinas/HPA0ihH/61034463530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505837/normal_5ff04ca5d3a8f.pdfIn PDF document text
    • http://xagelofitu.22web.org/54942113659.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/mjjjaB2/zoxuzuxinativimir.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/how_to_become_a_ussf_referee.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/heHMDgj/39037606990.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/Phcicd5/jungle_marble_blast_game_app.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/16979139146.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/geronimo_stilton_book_1_read_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawerudarasikow.myartsonline.com/29635193070.pdfIn PDF document text
    • http://wijogural.epizy.com/interior_design_book_free.pdfIn PDF document text
    • http://kanusilos.epizy.com/anchored_sheet_pile_retaining_wall.pdfIn PDF document text
    • http://ruxemad.epizy.com/balao_da_informatica_araraquara.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_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 5328 bytes
SHA-256: 75e2200dafb70180d38118b6e5d3727aaf15910fde50a08f646aa34befbad026
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 12844 bytes
SHA-256: dbfd81d4259612a5df7b202434165e11725c173185448e0ac1cc9639d95181a4