Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dc8f8ac869b907…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 16:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75f74c1eeef5f816ed5e6e37638e280b SHA-1: 5b74b5ebfeb55c35591362b03b9be958f3e0ae19 SHA-256: 01dc8f8ac869b90745d71f35b9b068ffe1cd0cf83c75dbd78fe8b554a41573e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or spamming operation. The PDF's structure and embedded links are consistent with attempts to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://laborke.ru/uplcv?utm_term=fastest+android+smartphone+2014 PDF link annotation
    • http://szm.hu/userfiles/file/45268615675.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/lasegedawod.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/turowibejules.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/15777035121.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/minexinogimenovaterafe.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/gerazuxuse.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/49168974151.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/85654532201.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/vesaliwurafapuvawo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/jixazug.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/76855607423.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/demad.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/13987835843.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0c2d2f8f0c3844ed2bd6f4d5a474f246/zetuvalo.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/7950694255.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/suxuvikupuxetetekajaka.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/xaxolaboziju.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vusijoxekivuji.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/wavuninekubovusaraxirejin.pdfIn PDF document text
    • http://med-os.com/user_upload/file/tegej.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/118812403.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18766495061.pdfIn PDF document text
    • http://platcometals.com/images/file/66713739680.pdfIn PDF document text
    • 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_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 10960 bytes
SHA-256: 76fdd493ee919edf3c7ef72b315c26ed5888ee9fc3ca979ea93366b6afc7e7ac
font_01_sfnt_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 17364 bytes
SHA-256: a9d12a0014c36e725245f7de5e18592bab6430bb51759a2a29204862e403686d

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