Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc8aaf4aa2f65f9…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 02:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2b7fd14894e417b6952b87e665093f7 SHA-1: 0a448925f521cee972ec1e1f1d02d89a25d843dd SHA-256: efc8aaf4aa2f65f947660532c2ba090c5cb203e887d483fa79917fbc0be353fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including an image-only document with an action trigger. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm used to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://spadhotel.com/basefile/spadhotelcom/files/tujebozumuzegevenaradizo.pdf In PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/narugijosowapaxuvaga.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/30315502617.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wuxazizig.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/dugalexexa.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/83387834947.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/nomexujuf.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/33252542504.pdfIn PDF document text
    • https://eslms.com/userfiles/file/juxonotepewatadoreruti.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/89343643082.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/35046205245.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/zosavo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/febasetivesefowodupiwo.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/fawozi.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/javinelovize.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jupelemitoja.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/72839339228.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/30477339656.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/dipolebaxulovurupizanasan.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161320f141a1ba---8295214445.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/35191294471.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///96720630292.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/siduxanejusalavulux.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090308071220.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/powidixolixumabuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=card+wars+mod+apkPDF 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_off0000afe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 14408 bytes
SHA-256: 4baecd710144a5411578cda44854383d63c65c5f62557effa4bca92f37f63ef1
font_02_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10292 bytes
SHA-256: 7b7898516a56b6652d4c58332d6b35ade002644af8b000d6f0f42037a4e28d6a