Malicious PDF — malware analysis report

Static analysis result for SHA-256 250ae08dfb8c1bc4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 20:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb191c80f29e41afb140d2d714fb0943 SHA-1: 2af154bcc873a69faca5ab2be5aec35b2eebd689 SHA-256: 250ae08dfb8c1bc46326c9461011f75c351cf5809ab02af000ae4808947fdd8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://luatsubienhoa.com/upload/ck/files/zesojipede.pdf In PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/30062181137.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/jariwokotogat.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/42812329000.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/nirufibajuveg.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/vaboxelarekuwujukoxizekax.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/rakixemosax.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/goborivamupagimasonixes.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/cec0f775939abefba018c493c1ee4f3d/xipozeva.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/vufodilav.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/61018849348.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/67243044529.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/54875007762.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/poxetodizu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142969cbb6c7---lavubufidurelidumonik.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/35811154831.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/20886972265.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/livafabeba.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/20513434408.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/jopasaduzivijuseza.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/kujarudizogopi.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/parud.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/40475101280.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wenipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hollywood+dubbed+movies+download+sitePDF 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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 16556 bytes
SHA-256: 1d1cdbfd245c5e5996321d972f56778c7d882bdcdd0c2f8eaec62a9bd503dbb7
font_01_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10808 bytes
SHA-256: c6886c6a67ae395c6cebdb62d87a6ce806ba33719464bfd80349bce9cd905805
font_02_sfnt_off0001250f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1