Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4975fcf2e792389…

MALICIOUS

PDF

67.6 KB Created: 2021-02-21 06:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 91284974ec32ae13f8181694a0febb7f SHA-1: 16a0ece87f281825563d4ceb55b8df76563bb881 SHA-256: d4975fcf2e7923892859369254fd94d5936e53b8f6af2d56d4ea3f8532dd3243
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://crophysi.ru/123?utm_term=ozymandias+poem+annotated+slideshare PDF link annotation
    • https://cdn.sqhk.co/juvowisire/jijfieO/samilurizegatu.pdfIn PDF document text
    • http://info-pages.ru/vivavifupesi2bdkn.pdfIn PDF document text
    • http://insurancesouk.com/97496431340ailnu.pdfIn PDF document text
    • http://contact-git.top/sartorius_muscle_stretchesrn3p9.pdfIn PDF document text
    • http://mnclassis.org/johnny_joestar_outfit66s3p.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/iatiaFC/best_heroes_in_castle_clash_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/rugfhaS/98830464061.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/49253612175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surotatifezuxe.rf.gd/93237043780.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/template_undangan_khitanan_png.pdfIn PDF document text
    • http://zodabozaloti.rf.gd/sokarakufebaluduvuraji.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/xapubevufobumakivepilag.pdfIn PDF document text
    • http://gubuker.epizy.com/turejirapu.pdfIn PDF document text
    • http://fafalibowadavuz.rf.gd/sawijadunaxata.pdfIn PDF document text
    • http://vepofuwupalufik.epizy.com/xajokeje.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_off0000ccdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDC 5380 bytes
SHA-256: 380a7e36ab5da2d63322133c5956a5b6965d20242f70e60231f2d8e543cb94f8
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10212 bytes
SHA-256: a19cd98bd8ac3960cf804fbbad6838ed8e4f1b1dc8ced3e7f2963a761f547a06

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