Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cac63ff9cae539…

MALICIOUS

PDF

67.8 KB Created: 2021-09-13 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6e35148f5406b0afd9df1c4308a3e149 SHA-1: 4861e03cc4bce1a63fa9de237b711263e1fe9432 SHA-256: 81cac63ff9cae539b834d032b1542611d1f380ec2cc11b45943980dd26ce6da2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, employing an image-based design with a clickable action to redirect users to external URLs. Embedded JavaScript streams and numerous external URIs, many hosted on potentially disposable domains, suggest an attempt to deliver a secondary payload or conduct credential harvesting. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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 67 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 https://askisan.com/upload/ckfinder/files/66048899518.pdf In PDF document text
    • https://eingangrad.ch/userfiles/files/13474350315.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/28022660679.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/67584018601.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec29cb574---sedurowujoninuzuwomelaf.pdfIn PDF document text
    • https://ms1oke.com/contents/files/pitovupiruridizamozeba.pdfIn PDF document text
    • http://telecycling.info/files/file/60157426266.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wowuxebidepazo.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/jivasifox.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/24520039295.pdfIn PDF document text
    • https://value.ae/userfiles/file/gateluxivusipomaxa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134080a834ce---megebaraniwezedalajis.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/14415208407.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/tumavazuxasibapasabakazas.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/99319676280.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/xijuleguxafamawupu.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/3841217808.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/busuzaliz.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80822441682.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/seketozuvunadagat.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/50086309032.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/24934937251.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/54620367979.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/winaluru.pdfIn PDF document text
    • http://reopen911.info/media/file/kagerafa.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/30748075127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+record+a+voice+note+on+androidPDF 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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 10292 bytes
SHA-256: cca46f4a6ceabb1f888c3815a6b7b9e5e794872915ec1f3cf31f824567eac977
font_01_sfnt_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 13940 bytes
SHA-256: 447150d27553f7ebbd72ac10a62111e5cbad4a2e34b9ab94810db8f81e63ce7f
font_02_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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