Malicious PDF — malware analysis report

Static analysis result for SHA-256 282663a7bec7c9b2…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 02:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6429716c2fbc5d121796911d54795315 SHA-1: b2c33facc05d61372b74507190d8bc7ed3202a8d SHA-256: 282663a7bec7c9b27c15d5ae091e2daf2268a71c1be199caf13cbfcdc0b69be4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=round+and+oval+window+ear PDF link annotation
    • https://agrando.cz/files/file/24052318368.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/nenobakibig.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/55850135747.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/vidatozetezilozosakupon.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/53868409569.pdfIn PDF document text
    • http://ccshecea.org/upload/files/4645813543.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/vasasodukemapag.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/dujamexowinijego.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399719adff7---27485424993.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/82019844327.pdfIn PDF document text
    • https://digicpictures.com/downloads/14450999041.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/tovepezunevubij.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/98366433485.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fomokebetuvidinu.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/ziwukolexexomexafuvudu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gutaxokejatari.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/fenexavafefetigit.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nagurufizilukigupexemuko.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/betuxu.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/xofesegos.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_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 16564 bytes
SHA-256: a669d18530ee0c550946a4f41fd2a1f0bbc59bd4ab9019ddee06134937ad1091
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 10272 bytes
SHA-256: 9c8f638ea3662e6ae61bb3bf37da5f4c90f255efd3e5aee6e58e40ddc71cc270
font_02_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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