Malicious PDF — malware analysis report

Static analysis result for SHA-256 8288b7f8a8331a06…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 04:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49f60d6952b17e7b2de886d0ad33cd61 SHA-1: c9576887ecef3e106507b458c6b2595b849e5f94 SHA-256: 8288b7f8a8331a065f49434c461a6d5e41e189acbfbae17484c2b299cea2709e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several pointing to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shopcode.ru/uploads/file/wogujul.pdf In PDF document text
    • http://kdekdyjak.cz/data/fovedekepujokojinumobep.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/40209274722.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/vevajikurowimifopibiw.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451d6b1d8a8---34814792316.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/23142065251.pdfIn PDF document text
    • https://akemi.ro/hirek/file/gifinuwiner.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/98070217105.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/881a3dbbdcc02e81b351dec6cdd276b3/59231300606.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/99750275239.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/nujeniwafubo.pdfIn PDF document text
    • https://fishboat.hr/files/tuwaxiserevofopuw.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/zakak.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/20378138607.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/52855914563.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/48460775795.pdfIn PDF document text
    • http://davobio.com/upload/files/83639690248.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/51329812941.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/63436445562.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/xuwubujaporoxisojuwal.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/27625434707.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/49136652591.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/weniburefibuwowe.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/8953255607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=epic+levels+5e+pdfPDF 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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 10212 bytes
SHA-256: eeb613dd1f0d348b6bfa8fc5ed8b0e84dc592a49f288cf1d9bc5af0077e2f41c
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 18928 bytes
SHA-256: 86faa363dedbc549f25f3dc7591a7e1c42ec42d9f8c32801c9eaafdc3c1c25b6