Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06136743fa7c644…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 22:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4d46f784e98087c39df9eba9f2ffae71 SHA-1: b90dec44f13d2b456be7344f2390bb7c3573f809 SHA-256: b06136743fa7c644451bbceaea4ee3612302bb765e3304e6c19911a94b013bb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, indicating a phishing or credential harvesting attempt. Embedded JavaScript streams are also present, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=full+movie+telugu+lo PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/be439e96be90e98c1cac1f73294b19f5/57295826602.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/43879089159.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/59947940865.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/paxozusawararulug.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/17249257000.pdfIn PDF document text
    • https://manenshop.com/upload/files/napidenubetodixojuma.pdfIn PDF document text
    • http://benetalent.com/upload/files/44541379272.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/10811356606.pdfIn PDF document text
    • http://islandpointfl.com/userimages/sejimofagever.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/wesapa.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80081115888.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/87236273071.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/vofokenogemevedogirig.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/26467670341.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/51424328987.pdfIn PDF document text
    • http://full814.com/upload/files/doliwagazatizosupa.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/xolere.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/midol.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/34294980010.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/12654624780.pdfIn PDF document text
    • https://blv.by/upload/editor/files/27105156753.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/betakareluj.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_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 10060 bytes
SHA-256: 5f1407479eeb6ae0e2102b512c80047a99a311316d5a51ba6da7553e8ad97c08
font_01_sfnt_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 16280 bytes
SHA-256: 0fe623abeb8a81567934c44c80a389ef06b5d4ecb57e887c10e091246156a812
font_02_sfnt_off00010023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1