Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20cdb92234d15c5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 05:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f5dfe7a8c4d404ea7f301bcb707c3bfc SHA-1: a5dd9c1949f3565028f29690e3a53f84df6dc995 SHA-256: d20cdb92234d15c50266f61d2dcd2522b6abfedc7fcfcbdf2a84304bd136e813
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick users into downloading a password-protected file, likely containing a malicious payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mut-zur-veraenderung-hambuch.de/userfiles/file/kilurarogu.pdf In PDF document text
    • http://plechotice.sk/tmp/file/zebemonux.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/29531513914.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/xewupekusejosajajarijev.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/vewelamiwi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/15199441841.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/12033940357.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fobefokiluzirotunanufiwi.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/14302496971.pdfIn PDF document text
    • http://ridendo.cz/files/file/32509379945.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/bolenunex.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/74783810377.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/17001207998.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/62628630107.pdfIn PDF document text
    • http://aven.su/userfiles/file/29508824149.pdfIn PDF document text
    • https://penzion-palice.cz/content/80753843738.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccaf22a8d---68621559278.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///31203622923.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/96700216813.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/63289710647.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/38503976836.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/20511126637.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/59085740765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=live+uk+tv+on+firestickPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBE 16968 bytes
SHA-256: 871dfa7307184a00fb852e0abdb94fce831dfe31049fd5c7e261fc0f538076b9
font_01_sfnt_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 10336 bytes
SHA-256: eb3c6791ea719b107f8c4c20ba207fc09f0652d0e34a0d20b9bf18ea055dd10d

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