Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dfc350863beead…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 13:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c610a62b2b47221f59348179e09e9664 SHA-1: 2b24c649c045e54f1a0616ce7f981fc8c4141963 SHA-256: 52dfc350863beeada1425a7079292dd0638035095be51a6948167024b7e8be7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=ultimate+naruto+senki+2+apk PDF link annotation
    • http://bud-med.eu/userfiles/file/bijikalupeniluge.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/padepuwider.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/19026307524.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210912150819.pdfIn PDF document text
    • http://geose.ru/userfiles/file/4697526183.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/87755087622.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/68086049882.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/52011379192.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/wifegag.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/razevixibiwepe.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75907107f---25916304593.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/21992598658.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1f53a2be---33986660120.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/gakonudijepa.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/19714150138.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/wamivowawi.pdfIn PDF document text
    • https://masukpt1.com/contents/files/23793400692.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/28176483456.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/daludarado.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631585056.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/dojuziriparesigu.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/78271388601.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210918_3560873CD5A4FBF1.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/79737398987.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/13810954303.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_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17584 bytes
SHA-256: 81a9ee2c77f5a2bfca10721d9700317c762aa845d9e32edc70fb9d41210c9da7
font_01_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10732 bytes
SHA-256: 297f11236a7a5cc184c4d1b1307815e134581a3eb07a984c771cdce97ffee4a8
font_02_sfnt_off00012cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1