Malicious PDF — malware analysis report

Static analysis result for SHA-256 c700a7c91c117120…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02209739c34cc7b7dfa0602df665e6de SHA-1: 50f7350920d727b581538c05125d49fa57c0227e SHA-256: c700a7c91c1171204504e2d56e256c034848f30fef1ce6fd34492f800b455e01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of many unknown reputation URLs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://graciaindoutama.com/kingkong/userfiles/files/67679984291.pdf
    • http://allprintusa.com/admin/images/file/sibisugetevexebatujidanu.pdf
    • https://pvesc.vn/uploaded/file/34140769958.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161349b2b22f99---58889741486.pdf
    • http://auburn-companies.com/userfiles/files/sujesokutojuwon.pdf
    • https://flavio-tonon.it/public/file/tijuvodanidofogem.pdf
    • http://cobe-ing.it/userfiles/files/84274430972.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/lorawi.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/19288077227.pdf
    • https://27061010.com/uploads/files/202109090816378512.pdf
    • https://santa.sg/images/users/00000000/files/rowidika.pdf
    • https://takitech.hu/userfiles/file/lerowuwusokisagag.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/rukaroledexupik.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/15994343409.pdf
    • https://coffotea.com/uploads/files/202109102210143733.pdf
    • https://phoenixturkey.com/upload/ckfinder/files/rezojifuxif.pdf
    • https://epponline.com/mentorfinancial/page_images/file/velokibirilele.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/72920587057.pdf
    • http://grafiport.com/userfiles/file/29361818144.pdf
    • http://ychnjl.net/userfiles/files/liwinalufubegexob.pdf
    • https://gelblighting.com/userfiles/files/mowematogo.pdf
    • http://teraval.cz/res/file/bubipegudexijopaduwimefak.pdf
    • http://zgkimsteszew.pl/img/upload/files/52702336740.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8031082---xibaremidesedagu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=workout+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 16792 bytes
font_01_sfnt_off0000f5cf.bin
7b030b3ab78149c08c93eb34fe99341b3666cbb0c866b2bde9a4f52a40b94aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 10332 bytes
font_02_sfnt_off00010d37.bin
1f45419278ab3f77f2f1373a054f15327290781bec3c3333c832cde8df334172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 18004 bytes

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