Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b50218a7a2f30b…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 14:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e72a0c8b08d6a2ab60903cb1bbbdbf2e SHA-1: d1390a79378fb967e72d1c0cffd7b160822df3ac SHA-256: 67b50218a7a2f30b6ae4d0502320c494844147c99de636a04bad8a9d439c076e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF with a malformed exploit stream, indicating it's designed to be malicious. It contains numerous embedded URLs pointing to PDFs on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://klimatyzacjaradom.pl/userfiles/file/84202995833.pdf In PDF document text
    • http://studiocastigli.eu/userfiles/files/79455161640.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/36972226391.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/jepaga.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/talujudiwirixuf.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/29961185728.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/28196883519.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/91726746889.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/ranixazekidikibapo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/75390914782.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/96363884286.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sulit.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/16952647636.pdfIn PDF document text
    • https://777mto.com/contents/files/berewewidulate.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/20057804360.pdfIn PDF document text
    • http://nbtele.com/en/cache/fck_files/file/75317176015.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/67864983840.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/48018965410.pdfIn PDF document text
    • http://irinabailey.com/upload/files/60106631229.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zevizimetifevufanigibap.pdfIn PDF document text
    • https://betsin.org/userfiles/files/fofusoforidasuwafin.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/katomaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=impression+in+malayPDF 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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 15732 bytes
SHA-256: dee20fa353bef19bbbb509e65c6f98f097e0121f1c477b49b67a31b724a55483
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10380 bytes
SHA-256: 7eacd270563df05ac980097fd83c7f2b9be582fe388eb94d9b46291507541d1b

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