Malicious PDF — malware analysis report

Static analysis result for SHA-256 e271649940fe798e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 18:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1527dd4915137a2b08c17088e94ad966 SHA-1: 51a6e03eb97b4c9e002dc1182abfa98806b31a86 SHA-256: e271649940fe798e5f089ed9d4233f9e553bb4ec03ba99afce4f69866189b4f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution scheme, leveraging numerous links on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=funny+studying+gif PDF link annotation
    • http://hangnhatbanonline.com/upload/files/11697274692.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/ritefifozutekogaze.pdfIn PDF document text
    • http://identik.hu/editor_up/36947172659.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nivejoretudoniruw.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/68876130026.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210915175809160.pdfIn PDF document text
    • http://btcauction.vn/hinhanh/file/zogegamigasobupu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/747d551fa1e7a6b9fa4aa58f170b0e99/pijese.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/53611219777.pdfIn PDF document text
    • https://csn-alliance.com/data/files/11667225489.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/37075045087.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/21170994003.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/77971605407.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/pefulavozititilenekune.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/pefomokogateke.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/98649351236.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3ab389a1---xulesamin.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/41952131326.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/mererit.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/difotaxetaxodajilubakemik.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/48128010648.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/sivuvasipuluxuzuvijapus.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_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 10160 bytes
SHA-256: 330c9c1d9e0100f50bb712980efd2e752533c5d25f254ee4722e12184ec303b0
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 20532 bytes
SHA-256: 6f4f307bcb5edb5aa8fe5c64122948d0f3e3c42a618b8adecf6b7b9ea03ac649
font_02_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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