Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ec8a07aa4004d7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 07:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d250df9a619e37241c45567d1614794 SHA-1: 1427b4261dc920897eb2eb03d2456b3c6c43b0b7 SHA-256: 22ec8a07aa4004d7680ac63e7ef0ab4e1c5881f8906cfdeaf20946494653ed44
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence, supporting the assessment that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn----otbbfbbknchz.xn--p1ai/sadm_files/42922985462.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/39866873306.pdfIn PDF document text
    • https://12tiga.com/contents/files/dosadupakoponadite.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/tewakikenimatuzuk.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142234f4ab2d---jutuzukupimajanojujiz.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210903_AA93674AF311C4D8.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/guniwak.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/14772276859.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/30282680185.pdfIn PDF document text
    • http://iltorg.ru/upload/file/99520656208.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/76796381658.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/kifuredevokema.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/6550190934.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/14514881755.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/63213492334.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/kosawatarunavivi.pdfIn PDF document text
    • http://ahknchem.com/upload/files/72378052335.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/74364472631.pdfIn PDF document text
    • https://redac.ch/upload/1973607920.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u7o5dlv6vj0os9vvkp83jarq4g/26124832669.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/bopuxaju.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/60384905376.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/7692713148.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/kuxobegabuwu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/jexuwo.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/70837004326.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/gililogikatujanijow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=call+of+duty+mobile+latest+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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 18456 bytes
SHA-256: 50ad34f70afca392b3abc9f9c073b3ea3a26b9b7ea5a820249092f595bbf95d0
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 10932 bytes
SHA-256: d293be225618d6e8d0bb1b8b0ab6e132ce1f0bfd33f33837e489374e888db4e3
font_02_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1