Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6e0981df40ccdc…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 11:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5dbdd7ab1941d2b58dc8515c3331adab SHA-1: 83908bf69cf78b16ed0c60692ebb143a222ee2ea SHA-256: 9c6e0981df40ccdc0b64e872ff5a788497b43fa014f375e9266f1f362ec939bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • 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 http://ativn.com/upload/file/begipavuvijome.pdf In PDF document text
    • https://behagi.eus/files/galeria/files/57271137562.pdfIn PDF document text
    • https://domilot.com/uploader/files/leromamebidusis.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/rovedovilutofetimuwivekas.pdfIn PDF document text
    • http://hibertek.com/image/files/20210915_130557.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/ribolox.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kuredovosamigikofojo.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/92097221403.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/saruzorutubisugu.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/28474280638.pdfIn PDF document text
    • http://badgerhillfarm.uk/visomikim.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/miwevepot.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/bamarapujeramewonu.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/70910845263.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/14859905082.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/nujigeki.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/25277489385.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/foxizisu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c77a64677---32953525447.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/nivejakizabusogab.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/bexetagukiburolopulekezes.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/junum.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gawasinapozizizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=in+cold+blood+truman+capote+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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 17040 bytes
SHA-256: 43947dfd7438a793ba280068a69340f848f3c0083fa5ee569fb0a7fb5eff4bf7
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10712 bytes
SHA-256: cf695262d609eff2966144357426a898fdedb8ff5f0d02e92059024f3bbbaa2e
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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