Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e573daba7f039e9…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 01:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79e1e61a96b0a51123ba7477be8f799b SHA-1: 89bcc4ad1e518745dbf6bdbc83ae893016475d21 SHA-256: 2e573daba7f039e9658d95a244f63d2699c6d64e06c0b1bf3fd371132ab256b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=2021+tamil+movie+download+isaimini PDF link annotation
    • http://venkateshservices.com/uploads/40393573978.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/zajofexisawejibob.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109061130359066.pdfIn PDF document text
    • https://5udua.com/contents/files/luximewenasajasuz.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905073816952.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/8492847172.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/25449683474.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/wekuzumuviviviweradole.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/83477594159.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jagofegomasuwe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429b7a9248---26629701072.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/fonavisum.pdfIn PDF document text
    • https://jotelek.hu/files/file/92550479673.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mb3drv8s2r3q7ds87o0emedsa6/15531223889.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/22360238398.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904130909_523459965.pdfIn PDF document text
    • https://cityface.cz/res/file/vosurefudavis.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sanotosumiwofipot.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fojafimojinevofuw.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/jizonixebobabinadiwaf.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/ziworemikilopubo.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://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_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 10656 bytes
SHA-256: 7f00241976deaf615960843612565c2573e57e2de6325ca82429b0849622e692
font_01_sfnt_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 19100 bytes
SHA-256: 0bbcd31c9e3ebdb8db2e4f44c28faf198d9d7dd6df522cd85e0277ad9e6d6a6a

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