Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3d8065439a9b7b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 00:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c91fc487c5c88a9fd2382feb0f7828cc SHA-1: 1501d32b7e038447a633745fd4a1f7f2dd9af6ae SHA-256: 3f3d8065439a9b7bbedef7b9954aabb326eb5bca87b050e1bb45b71d543e7043
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that lead to a link farm, suggesting a phishing or scam attempt to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://krisoc.ru/uplcv?utm_term=download+hello+neighbor+alpha+3+android PDF link annotation
    • https://bdprescription.com/ci/userfiles/files/ragalotuj.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/32571110312.pdfIn PDF document text
    • http://fitviewer.info/files/file/48461339504.pdfIn PDF document text
    • http://logicamail.it/draft/media/65629902535.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fisita.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/42500882877.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/69224609341.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/86069929761.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/1203272531.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/73595731035.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/gobewuru.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/85651929235.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/sepexuvevam.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/27453081295.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/36259340145.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/79912898739.pdfIn PDF document text
    • http://arucax.am/user_images/file/49845187908.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1470c1046---xufixivininifemeruwinakax.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/nebulurubedofaseporogebuw.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/38882100003.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/dugonitivitan.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210916_22F5D0C298B0CD43.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/28911026334.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/mekinujikudorupogavekaze.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312039afd77---gexemefosofefubavusugiko.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/peposidu.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210921100723.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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 15076 bytes
SHA-256: f2a794c7d0423d32e2cf9a13c139b3f5af8447841b2021aed8b4feb00a136d68
font_01_sfnt_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 10804 bytes
SHA-256: dfaed65328af9fc22bf6bb07527272a7e1c014e3c6cec3b84f1a0829ba647442
font_02_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1