Malicious PDF — malware analysis report

Static analysis result for SHA-256 26456444966269e6…

MALICIOUS

PDF

71.3 KB Created: 2020-12-25 23:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a94d562cfcc744410b7cc58cb085ce95 SHA-1: e2f6d08d2da4daac4536f736f735655fd77381a8 SHA-256: 26456444966269e68b5b0e9f618ed43c39c9c62f0de494ed3fbdabe80c7ca637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It impersonates a cloud document service, directing users to a suspicious URL for a 'backup free cloud storage' download. The embedded URL and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://traffnew.ru/strik?utm_term=backup+free+cloud+storage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5fb324ce69f8e.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/iCBdjb8/text_to_cnc_programer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fc601f0214d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8743326a299.pdfIn PDF document text
    • https://cdn.sqhk.co/zokoxirinuz/bghDfic/diy_carnival_ring_toss_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fe54432d5d4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/podimavekixaguda.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/ruxidofu.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/manual_camtasia_studio_8_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3a1fac-6782-420b-a3a2-c602dc239bc4/meiosis_leptoteno_zigoteno_paquiteno_diploteno_diacinesis.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/afasia_anomica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887f4c0f-4341-4ed9-af39-4237d49ed4d7/mumafelonedo.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_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 5436 bytes
SHA-256: 0f96a991bd973528ffd13d4677a75ab1f5021669a9c12b41da3759d40c60d456
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 10116 bytes
SHA-256: a549d8aec5b475e6f3b335d5e16276f3f4858a6a7e8ff351c2426c8215594d12