Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f08156fb4c8a83f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 11:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 924a0bd5d77f601efc7f4ae29c156177 SHA-1: 54e54c8ff5537141f6007560d44b4d3f35d5cdb2 SHA-256: 3f08156fb4c8a83f0d890c90766d501759289b36a54e6f655d65f6be40ba1808
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF files hosted on various domains suggests a coordinated effort to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://neoneofytou.com/ckfinder/userfiles/files/33186820412.pdf In PDF document text
    • http://aftp.bg/userfiles/file/xuxunijivewudetijobujinoz.pdfIn PDF document text
    • http://arsvet.ru/img/upload/2364807104.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pqsrnkhk59j6lqghnalbtchmh5/wabojexubabokotiresojosap.pdfIn PDF document text
    • https://timminsrenovations.ca/file/k8m3d8wplio2qfDP.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630645738.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/38813958378.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/66663785165.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138028a9a4ad---41765399051.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/vabipuxu.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/vaperemosis.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ruzitukememuj.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/24968936207.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/26024359792.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021981756338040.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/benaludexejelufaku.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/53348661499.pdfIn PDF document text
    • http://dhf-china.com/d/files/lijuredudagobadogizobu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/depubotawanotiluzove.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/wanomujed.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gikivazamaret.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/puwija.pdfIn PDF document text
    • http://salt17.com/userfiles/files/xupelowegopevarisefenuwen.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/powitoxabubarurujigameju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=earn+steam+wallet+codesPDF 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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 18356 bytes
SHA-256: 3b491de8ae8d9b2c607d577c2b90f5dfbf09b1262787e0d8cf7363ff376dcae0
font_02_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 10508 bytes
SHA-256: 4a42efaadc8491cf589171ade7bcdb73eb7cb65c993880a471f62dfbcb86b54a