Malicious PDF — malware analysis report

Static analysis result for SHA-256 403735156908a8ab…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 10:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 78fb28a551a645cf038ff8e1b178acb6 SHA-1: a8679bdcf14ae775f9e80f0ff0573ee190d80faf SHA-256: 403735156908a8ab7101cb3c44b945ae9dd4cdc1587c41341fa1499355cf590a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely for phishing or to redirect to malicious sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://stadion-zarya.ru/ckfinder/userfiles/files/75383225665.pdf In PDF document text
    • http://massintech.ru/img/outer/files/farutozofamumoninumunorid.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/nokunofapujupodexu.pdfIn PDF document text
    • https://edex.co/userfiles/files/14763239306.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/zigiwepifawutamalowumeg.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/ziwikikefev.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/28319876117.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5f650827---fiminoruwimimogipejelurof.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/87366681946.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/87031904068.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/fumowagefet.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/bowidubagamurisadasafole.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kowewozitimokekax.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613984bc57ea7---gisokawudesosudev.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/soxanupexuvofujuretejalej.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bemudofarulimasuwubo.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210912220405.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/70167667501.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/muragumijo.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/12600512270.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/49028589306.pdfIn PDF document text
    • https://pepsima.biz/files/file/18800596499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=instalar+nova+vers%C3%A3o+do+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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 10524 bytes
SHA-256: 01b39bd10576b81b06f3ada011498f183b486ff2bdc9786a2ecaf4aea538e737
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 19944 bytes
SHA-256: 3049a037ca3b7de725eb6b713cf616d8b7c8b6eaee9235ffe9e0e3116b0fa7d7

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