Malicious PDF — malware analysis report

Static analysis result for SHA-256 37077d3f8be56a6c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 23:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4924fc3bb0fb58d399cb273c318b8509 SHA-1: 8b1eefcdc1d67be5ce00bc59ec40825488ef3314 SHA-256: 37077d3f8be56a6cc9cd5aa9e6949d40c7ae60c953749e936978ca20d700183d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=ocean+survival+mod PDF link annotation
    • https://mundolibre.cl/uploads/userfiles/files/dizosuteroligubuxi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/filowe.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/54632314033.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/5376841114.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/jusavometobegijemi.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/36589539080.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/doviworaxotig.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613befbb33b28---mukanazafarebufune.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/jevoteke.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/sisurezusekezu.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/natadu.pdfIn PDF document text
    • http://shamayachts.com/upload/file/5387278115.pdfIn PDF document text
    • http://myesen.life/userfiles/file/49627773346.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/94387523272.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/sugexedukimovusegefafix.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b3b0a883225a85061a44caa350588510/latifaxo.pdfIn PDF document text
    • http://velisend.ru/photos/file/tonuwanunifireka.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/42556696611.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917065233_3xl7xk.pdfIn PDF document text
    • http://dfanchem.com/upload/files/96085314854.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/28842763221.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/vuviv.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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 10624 bytes
SHA-256: b229555963e7500794fef98408f7df6de4a77009e8d0e86474ddd07e92484e32
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 17552 bytes
SHA-256: b0438651b178d62d42eb9e57650cd7b6d50410e77fb82ddf618460d01638a5e7

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