Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e437bc46ddc436b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-12 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5cc21f747e2897813eedd29bbc51895 SHA-1: 517f5c4d7e650cb3472c757d306314ac24ae61b9 SHA-256: 9e437bc46ddc436b147b1c667ae947a096f562762bd3e3e7cc216d01ef56e837
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. One heuristic specifically identified the PDF as a link farm on disposable hosting, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://0575zl.com/userfiles/file/37520445388.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/vidakezugufiv.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/76624539856.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/bunixub.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/74934459415.pdfIn PDF document text
    • https://12shio1.com/contents/files/45087461024.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/lurudumadowuzeb.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/bakoferivutodivu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/97114873490.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109081421057144.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/98452903266.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8a841c65---47105712997.pdfIn PDF document text
    • http://wohntraumgmbh.at/1047845003.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/58745395110.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/zolagulefuwe.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210909051533.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/57648341262.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210905033506.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/35882870892.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/92451749764.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/sokepikexigigijukenuravo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c1b8ed62---relipokikokekosasewijab.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/52865153625.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/bodibixupuzaxaw.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/ladogiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=camscanner+hd+apkPDF 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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 10548 bytes
SHA-256: 39b9c39f02930bf5c621e691dee5ed5972f182c074939338e337be9b6102d171
font_01_sfnt_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 14640 bytes
SHA-256: 98e36879cc323f8bd5290284c7dacfde1b3dc3df08dd203df324e9a0ccf1fee0
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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