Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a964d65142bc0f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 23:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8ecb493c447c08e52fd1819c50666a8 SHA-1: 229be5b65a29c2ecf1c8355d8007e610bd97aa07 SHA-256: 71a964d65142bc0fbf358feb03c6a79e2fd1ad85dd381d862a93694826ee76c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files hosted on various domains, suggests a link farm or redirection mechanism designed to obscure the ultimate payload. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.vita-organic.eu/admin/ckfinder/userfiles/files/metiju.pdf In PDF document text
    • https://trystsalonri.com/images/file/53044862551.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/xinusig.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/50517180091.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ced0d9ff---gafupevigope.pdfIn PDF document text
    • http://vecsecity.info/editor_up/58042940816.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1643206200613b85bc3e39d.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/bozotabofune.pdfIn PDF document text
    • http://skolky.info/foto/images/file/zuditaxalusuwojufanis.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/golexitixumefejuden.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/vumefirakezujot.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/nexizuserupokuto.pdfIn PDF document text
    • http://leise.ru/admin/ckfinder/userfiles/files/79733906090.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0tp4kpoub73i5ka2pbe01alun1/86992579885.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/82864024896.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/zitib.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/29851816880.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631528628718770076.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/56587279873.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/fugoladoxo.pdfIn PDF document text
    • http://devison-matras.com/upload/file/43322778610.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/83935159288.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kulagowakaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=panda+compressor+apk+downloadPDF 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_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 19148 bytes
SHA-256: d0c72eb021dd018199d1addb53126111542126e65f044b2c9c24cfa8e300e7a4
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 10664 bytes
SHA-256: 84b3049f8fbddd3c3b86e18364b3b7a6123622bd3d1021df79e71d60797732d1
font_02_sfnt_off0001325a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1