Malicious PDF — malware analysis report

Static analysis result for SHA-256 91149bb3fe808d85…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 09:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 974401444d40c59c1324728a34dd6486 SHA-1: 37c3e1dd7bed5045c74bc6ccafd2709ad6b48bdf SHA-256: 91149bb3fe808d85a9bdde090155ceb6b64bbe477fcb1720abc10470cc2e47ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and ML classifiers also flagged it as malicious. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://noithatdangcap.vn/app/webroot/uploads/files/63233949298.pdf In PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/renimoto.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd0e184f9---27670242869.pdfIn PDF document text
    • http://djpress.pl/Image/files/wotogekazojekedozaxor.pdfIn PDF document text
    • http://kccmaul.com/files/files/21504481650.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/soxuranixaw.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xitobabusexukemowir.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zadazepekupuratorexi.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/budafumejiraxu.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/60223245941.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zamep.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/degabizewura.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/fagijuxaligavulo.pdfIn PDF document text
    • http://hzqzg.com/d/files/zidonesixubufelebe.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/95708353118.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/42060711846.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/fixawarotizijugafetodi.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/65714151159.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/vesazubot.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/xukesesudotib.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/mafuzapibuwe.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/lemudibumasofe.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/27765805518.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/67302735956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=install+chrome+os+without+linuxPDF 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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10736 bytes
SHA-256: 990e780b6716f76ac319024f0dc85c27351c1994c2ca4bc7653b0f02ca8e92ec
font_02_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 17552 bytes
SHA-256: a3a2256beffdd6d25783d0341c65c89830d71dbf7751625d9819756cb6142ecd

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