Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f9fa5eade837b9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 18:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 286c0a516ff5c945603a2081f32bd55e SHA-1: bb7ee3d71f06463f193c4bee7a6c19d6bfe0a60b SHA-256: c6f9fa5eade837b9c8649d34db0214c109f00bba74210627fab5122bb72868e6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a critical ClamAV detection for 'Pdf.Phishing.Trojan', and a heuristic indicating it's a link farm on disposable hosting. These elements strongly suggest the PDF is designed to lure users into clicking links that lead to malicious content, likely for phishing or malware delivery. The ML classifier output of 0.997 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jobsandhi.com/uploaded_files/userfiles/files/12131534458.pdf In PDF document text
    • http://acm-medicali.it/userfiles/files/78702669701.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/koxagete.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/metafalozazelofina.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/63872090340.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/65086630483.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kuzibanofokarozorozoxowig.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/26714382546.pdfIn PDF document text
    • https://cristalensi.com/public/File/dogulifatefo.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sobebugati.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gitisunibazerifowotimew.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/pemogana.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/retoterakipera.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gusax.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/vemevafope.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/67931565784.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109071942075721.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/wuketixov.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210901_B2FB0984FD99FB63.pdfIn PDF document text
    • https://braus.uz/images/shared/file/11208173785.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/97379286497.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/susojoj.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/10353143538.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/mewagemugaginakima.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jorufubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+keep+hyperlinks+when+converting+word+to+pdfPDF 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_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 11084 bytes
SHA-256: c5e0aa6e1108a7252a8d3a34b1b4d13ec787e5ddaebbc7cc4103289a82f0a92b
font_01_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16828 bytes
SHA-256: a0be03611c2508d5c602e2ac50867f80ddce9bc115654f66b6b131ec0bdd6751