Malicious PDF — malware analysis report

Static analysis result for SHA-256 829eacb3d5d7be6b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 16:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fe4a0191a9496620c15d45802971348 SHA-1: 881cbd35bef1538b0597f218d3b058b67b8c9d26 SHA-256: 829eacb3d5d7be6bb1c6a3369a2106efc6fd9c628a4d6bac2899e8075e9aedc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one notable URL being http://autosoftware.company/autoresponders_images/files/92020458621.pdf. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://autosoftware.company/autoresponders_images/files/92020458621.pdf In PDF document text
    • http://31kouqiang.com/userfiles/file/1630805191.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0385e860---bakejadiwibugopofibidelox.pdfIn PDF document text
    • http://odumakus.com/uploads/files/wixifezaka.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/bafufojurowesotibotikut.pdfIn PDF document text
    • http://eksternest.be/images/file/91084809079.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/rarovazalorepokumaliwof.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/70006830011.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/virivovonejizoxe.pdfIn PDF document text
    • http://retailcop.ca/files/90285823718.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c4dca377d75508e053b194f1447b8e02/xarano.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/pexagonurivizupejezuza.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/59775832145.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/gunubazaguvopuvafuzol.pdfIn PDF document text
    • http://www.77ice.com/upload/files/kasogewewedezo.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/baxiniwufotosatemekejaj.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/4184660674.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/63457653310.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kavutupepolimejov.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/satekis.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/30301549335.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/jimadi.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/jibesutexedas.pdfIn PDF document text
    • http://insei.eu/userfiles/files/tizowunifosoxagetukuxu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/73050522186.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/26206164796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=battlefield+2+bad+company+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_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 20028 bytes
SHA-256: 288aa13673a995d08a2c39881f148f436e5e326c16c00b5f50b83df9fcf6499c
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 11120 bytes
SHA-256: e2930bc7faf984420a195b1435711a48b42d69e2fe9491de34c8d65ffb93b87f
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1