Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf752271e8c8059…

MALICIOUS

PDF

75.3 KB Created: 2021-09-24 22:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f76adeccc870f7541f9e0ca60207b5a5 SHA-1: e357d0a47984878e1915f70dc36d67d226c99b43 SHA-256: abf752271e8c8059131cb0c9e5fc987988f4bba5fb22f8012aaa966ddbd58e16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a phishing lure designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec9153c19---jezefaruzexeni.pdf In PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/39007674491.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109121031102533.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/desuvoferesajinakoxevo.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/53269658764.pdfIn PDF document text
    • http://ibb-online.ru/f/file/xomabimulanofezob.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/66406324732.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/50813325516.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xopeda.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/sufenuj.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/80318389085.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/94820048857.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/90130286960.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/vaposudedusibopurofukep.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/83657295806.pdfIn PDF document text
    • http://dsfly.com/uploads/files/25053426717.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/63420046133.pdfIn PDF document text
    • https://ubranni.com/uploader/files/28854809211.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/sijaxokojudutorajevari.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a638cffffbc101d51f5c4ebeb9ad4e89/nazoxefupifap.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/49912716878.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/10345755911.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fitisizogomidulonufatuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+emulator+apk+downloadPDF 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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 10644 bytes
SHA-256: f08364b0a827589dfc68f43eac2c1b61b9cca36a9254ffef0244747719c6e807
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 18368 bytes
SHA-256: 3b3cbea74753f0547b6edef6b25530f7f5ade014b011b0870acf019bedd2e1af
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1