Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0cf0b6557fdb97…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 19:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 018711428179a6e0365f657384c887e5 SHA-1: 615a0a0ae04c95340a1ecbdd23a8bda38eb94e17 SHA-256: 4a0cf0b6557fdb9789b1b32a3528797564cd4d2e5cd6c95667d5771a3115f4a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bartonsteel.com/tony/barton/ckfinder/userfiles/files/70528284668.pdf In PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/deraxisunatopemesepiritid.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/41811139965.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/xenudakaxovi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909031212.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/49931964277.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/40931316412.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092615093593.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6130300CAA3E2.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/fokejagawelesulaju.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b6131c727e6c1c252ee3728911939433/lugawunikoriranezedipun.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/vezafinofevebevaduzopezo.pdfIn PDF document text
    • http://anindecor.pl/files/file/zotin.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/69144376685.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/15658311417.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/dujapinado.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c52cd2879a---zabatukadilava.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/bukubopo.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/21362389696.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/67832509929.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/77234120254.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/90347203255.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/fokinivugasofogozupugev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=super+mario+game+offlinePDF 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_off0000aed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E2 15740 bytes
SHA-256: 392483600b14f4bf89576f5c6031a749150686fc596fc648b56fff615f502d67
font_02_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10608 bytes
SHA-256: 96edeb87d9499aa7df72fafa7379839e2bf746954a9d634b3ab283264705b5a8

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