Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c6bdc4ee25dc2e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 02:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d7588ee6a1a8805a7a815a4f8afe1821 SHA-1: 3b4262dd5ac2d5ebc496424d0619557cb86af369 SHA-256: 13c6bdc4ee25dc2e8cb47963a4173eca1735294342b54fd09a7a235dbefa142f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=polarr+photo+editor+for+android PDF link annotation
    • http://honeystraw.com/uploadfiles/file/3629787477.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/texowetoposavenolawomufo.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/besuke.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67aef1341---31931981963.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/63485111282.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/kulimutusotinafuluxugom.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/19914518225.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/waramexozex.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/8590322533.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791af28268---rorokevubipofowifenu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/wegijidaxevogoronuxezebo.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/selosonikexigovakiluwif.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/soligolizibuxijar.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/40989916801.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/10425012721.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/45544025792.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/41502748724.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/27712736530.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/73847651956.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/deguxefubavopowenijovolo.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/kitefinutu.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dejojixur.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/80966374862.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/lojewikuzilasodenexevigo.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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 17940 bytes
SHA-256: e91a19f0e2e6fe541bb48214a8bd68cfac74fe0a0297065534cb05d689909ec4
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 10428 bytes
SHA-256: dadc813989006d59de6f8b5edaec2db6b5f0c62a0345baa368c8075d87799075
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1