Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb63d54a6110671f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 15:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09cc16d74da33a8d006711b2f289cc44 SHA-1: 875dd8e701ee473f1360ad0e4e2340054b52c73d SHA-256: bb63d54a6110671f6ffe19f5b85e5b4e97725490441009edc4eb5bc6a63ec04e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites for phishing or malware downloads. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=touch+vpn+free+unlimited PDF link annotation
    • https://cheeselicious.net/UserFiles/file/vozuniwibijafuzi.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/vemekiniju.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/27314861549.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/239384ffa874cfce1712c8094aed125f/lutiwur.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/34998109841.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/92398483774.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00b28254f---javafuwewa.pdfIn PDF document text
    • https://titishop.co/upload/files/komapezuzi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/setutosuxefodinopudil.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jofukugokovapizogaz.pdfIn PDF document text
    • https://netlandschool.cl/files/70417074774.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/wewodir.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/wuxuze.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/bukegoza.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/9642301030.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/kotubugebevavepufikelage.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/20599692420.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/52822639274.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/27071290149.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/gekebokapem.pdfIn PDF document text
    • https://edgecs.com/documents/30747359370.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/timetemelez.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/51510217235.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/19139567631.pdfIn PDF document text
    • 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_off0000b78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 10684 bytes
SHA-256: 09dce76d74e780b5cb7778b57cf7bbc767c9bb66bfd2c05869865f4faf875dce
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 15068 bytes
SHA-256: 134f2243c7bdb0011df86585586253c279422a4d505698782f5bef9d899623f7
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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