Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65775c5261d78c2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 211deeb1e41424a1a1399a9766cd4220 SHA-1: f712f5052678dbb3c6544f7ebbfffbfc1004f18a SHA-256: e65775c5261d78c23be79896e4eb59056791f45d4231791076266326fb8f8664
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains, likely for phishing or malware distribution. The presence of many unknown URLs further supports this, as they are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sushinamu.com/uploads/files/zelan.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/27823339209.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/66295554151.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/jebijojerim.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/97082036840.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/94200220559.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/85617493760.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/46801739999.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pofidazejitu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/26610757705.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/30690174989.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210901183542.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/68745484882.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/4025381971.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/didiwenakif.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/35727170662.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613008732deb1---18272564895.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614089bfee4ec---tukevevilejedejepap.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/vikepofugupumajikuzutomab.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/xovelite.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/16934519521.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/perijemirelulugogolevomog.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/xafoxanase.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/ritefifozutekogaze.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/wofibaxado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=phoenix+os+netbookPDF 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 17284 bytes
SHA-256: d091844a7e2f93976a58a9eb5566b2bde33994db0a0a714e89b81f1c6152d9ff
font_01_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 10232 bytes
SHA-256: 69e99b3af9b27ac3de5922be4950e136ac7144f011ca798a2c6416fee694f15a