Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d63b56f3410b91f…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 16:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a77fc2e56530055d6f5fefbe69b23ea SHA-1: 9b04abbb6552041dacb5de756139635a42ea14e5 SHA-256: 0d63b56f3410b91f0c0f873baec88ac57a6fc84acb1cd48773047bd93ee65245
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=les+avantages+du+sport+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410954/normal_6019c9b9b7631.pdfIn PDF document text
    • http://honey-love.ru/18878022987d9g8f.pdfIn PDF document text
    • https://cdn.sqhk.co/rejelozekazo/haTJzrL/minecraft_skin_browse.pdfIn PDF document text
    • http://relax35.ru/post_cva_treatment_guidelineslntme.pdfIn PDF document text
    • http://tehnotop.store/667409691118hnck.pdfIn PDF document text
    • http://grigolia-studio.ru/53234811839mrep6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_605b614985d05.pdfIn PDF document text
    • http://vostokzapad.su/mejumev7l4br.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_6010008f60023.pdfIn PDF document text
    • http://avtovishki-msk.ru/258052610348avcw.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/hgIowhi/kuzenosujed.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/jbIjijb/77798277112.pdfIn PDF document text
    • http://autokenn.com/58027001337oij8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_60085f8af148d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_604e12431c70c.pdfIn PDF document text
    • http://sethel.xyz/dry_cleaning_slip_templatevwsp5.pdfIn PDF document text
    • http://dezunanerab.iblogger.org/tilafitijeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_602c77aa25797.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafuxipadirates.rf.gd/zoketuvemafusavisifunur.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 5180 bytes
SHA-256: 34729a7db6ca65937ae334c7c8b1c9e1557d9eaf917da2e53d428753d1497d87
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 12288 bytes
SHA-256: 592f57bb8ce8f9ebc0e079fa2e861f1f8285059595e522a7e63d0138c5d9182b