Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c68d02f48f40b9e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 19:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 907ccbeff1102d6ed9b7d33f28f1bcb1 SHA-1: 2d8750db99502eef2766f4b25ca8f4b38a7d36b8 SHA-256: 8c68d02f48f40b9efceac5531fc21479e73063c5c4899e638a2dd2749135517f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bimbrlata.cz/UserFiles/File/fukasajinijivijikejaxip.pdf In PDF document text
    • https://mebelihome.ru/upload_picture/nizuribopetapagutixik.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/vawod.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/82555587946.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/gamas.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/44592434748.pdfIn PDF document text
    • http://brukbet.com/user_images/file/81753046401.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/18782643448.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jevuzidolo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/80858631856.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/noponeb.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/kuduvefumetinulodesod.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/28294707820.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210912235848.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/8702160574.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cebcfcac---vijutita.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vowomi.pdfIn PDF document text
    • https://irantruck.ir/data/file/78342531115.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/88243089189.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/97437384749.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbca51ff6---xikikixopafit.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/suxagol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=samsung+galaxy+note+21+ultra+vs+iphone+12+pro+maxPDF 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 17220 bytes
SHA-256: 5c18322198d279e46391548c2894f9bddb48db418b6fb1dda8b460e1c6379618
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 11328 bytes
SHA-256: f490ae6dfc2311ed551e548c1c780b66e565273647e562efa69aad42e79105bf

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