Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3653c7065a944b…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 14:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6759391fe038c658ac9d9c90aed86d7f SHA-1: 6954da06e123b1359163ee6ead5e499d8f20c5fb SHA-256: 9e3653c7065a944bc8d794b283a111abc27fe7b636e975f9aa1fe47890fef334
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, particularly http://aeusjtu.pretty-match.com/upload/files/30503795789.pdf, are suspicious and likely lead to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aeusjtu.pretty-match.com/upload/files/30503795789.pdf In PDF document text
    • http://studiolegalezullo.eu/userfiles/files/65246625601.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2d551fb5eb98d67ccf36c844eade8def/zitomawikewitipim.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1551392c6---98692116988.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/kukizomazafulilegunib.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/wabevavoxitarumux.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/girisujogidutokogotozo.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/23990862453.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/34380246981.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909045015.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/sotafodoxola.pdfIn PDF document text
    • http://tochalco.com/uploads/files/34848664935.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/tevolularuzazaramopasem.pdfIn PDF document text
    • http://spharma.ua/files/file/18644408390.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/tizidexiruzujomulow.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/dutesojofizumuvi.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/peletini.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/wotulakox.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/bujuboxudap.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/21780065103.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/dukemaziludofeg.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109012132523026.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/nipur.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/sovabib.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/64728942970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kamasutra+of+vatsyayana+complete+translation+from+the+original+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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 18772 bytes
SHA-256: 13028bf4d01d45f1957c722465a62695aa88ebd2e5356e23cea31fc7924f41c7
font_01_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 11340 bytes
SHA-256: a770f8e484b5c165ad580a81a3b697a55bc303901ad119b14feccfd1a809e127
font_02_sfnt_off000137bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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