Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6681eca411d7ae…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 17:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7691840dc1bf8751689ec4a8f112dd3f SHA-1: d5450980af4b4d14250ab172e371eb0b87274d05 SHA-256: ad6681eca411d7aeeb91f14683a20aca8b26fcc9928dc536032c98337a91a192
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only presentation, typical of a credential harvesting scam. The heuristic 'PDF_IMAGE_LURE' indicates a click-outward action, and the presence of numerous external URIs suggests an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613247bb210f6---16786089492.pdf In PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/waniziloxuwoxijejij.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/vigowowolemijuwakefotiv.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/17097347939.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/63781211999.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/vemaruvoletajibe.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/vunakirivojapapafonov.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/27947029384.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wakifobajasak.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/99866661517.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/22607236123.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/giwejisisew.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/naxuviruxijugakeg.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/96492368539.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/tesobinipudijoporololur.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045523cee3---48921502566.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/tafunodizemusi.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/57226479843.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/pajilazamar.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/buxefarenejubunukotiwo.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/20377982999.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lenujesesepeje.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/75800511592.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/lepukudixiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=friends+with+benefits+watch+onlinePDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA98 14084 bytes
SHA-256: 72c54fc8d2d548f2bcafb12b4c7bac124a430d0659deaf1656de734e0fe0af01
font_02_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 10776 bytes
SHA-256: 8427ecf581c38b9eef353630be6ab39dcccbe10fec11a9acf8fcdf75ffa68520

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