Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7db91857574b7b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 22:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b92db0b6be1848a94e1da9edcbd4123 SHA-1: 7d1445103ec22fc08b0072a3636d93f417a50d45 SHA-256: 2f7db91857574b7bf0d86e5ee1c2ba1246a233b7f8319c3870484f2f0533f5a6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF also contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. The JavaScript likely redirects the user to one of these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://sonerofset.com/userfiles/file/zawiminijojimis.pdf In PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/99606787747.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zatabewu.pdfIn PDF document text
    • https://primer-spb.ru/files/files/jurutojekizidatof.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/numufanuxefoworano.pdfIn PDF document text
    • http://strahyi.ru/images/file/75829698195.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/63917218424.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/kiwebiz.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143963f1bc1c---medewogujuxepodavufate.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/luluziwur.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/44364937489.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/88169252823.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea96a3760---43781071315.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xulatatege.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/58616767806.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///98142042430.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/lidolikigalawebufa.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/puseba.pdfIn PDF document text
    • http://salkim.com/userfiles/file/rusuxajedipuxanenukasuz.pdfIn PDF document text
    • http://floramarble.com/uploads/fulinesodikelawiwise.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/gutofafe.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/73941273677.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/23746799931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=coc+hack+version+unlimited+everythingPDF 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_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 11220 bytes
SHA-256: 418f3a55a1127f3d6922978f016a4b7443e52e6d7417a2a67bf06e4b1887f8cf
font_01_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 17284 bytes
SHA-256: 7ea0bdbf2e4acc488693e1ca1e4e55f89a5404c638f9b0c357183b6bb99ae468