Malicious PDF — malware analysis report

Static analysis result for SHA-256 607ad5e543081625…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 18:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c304cd9cf2c9678ab0c1cd732795ac7b SHA-1: 68470bcc70a936450d7aab7cda38ea6a1e7a0f77 SHA-256: 607ad5e543081625543c40a1605413f4e4d71a7848b40ad1d525f9b69455372e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'huntic.ru' and another to 'yujinpharma.com/upload/files/juxefevib.pdf', suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate it's likely used as a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=multimedia+download+for+android PDF link annotation
    • http://yujinpharma.com/upload/files/juxefevib.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xelexofinalef.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/munifazo.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/67579019032.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/10014999380.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zomagejiniwamopigoge.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc152829a7---3792733092.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/55969319869.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/65111142741.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/77365664404.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/94795102954.pdfIn PDF document text
    • http://vkts.se/userfiles/file/nefavejuwigokefume.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/melovuwixonilidoto.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/65745221422.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/lurogeniruvopuma.pdfIn PDF document text
    • https://hobbypet.cz/files/file/suzojor.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/67040847321.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/bumevubuwejuni.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/83890310920.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/55075285103.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c30b05694---21050555718.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/watafadejetajalobagapugim.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/66006537973.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/gorunefesonitarelu.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/41594689523.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 10528 bytes
SHA-256: b1ea0dfeacadecf47b61647cbd1b26e84f2665553c7cdc3c9245604897bd96b2
font_01_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 14368 bytes
SHA-256: 60f06508721c550aa54418291fe73748ce225055fe94475348010c781d6b1347
font_02_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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