Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a0fdb618c0e2e5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 09:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1af085971d6ff2062e634b07840ce5a SHA-1: e4851d43cfaa51db4c503c0137e928d10357ad9b SHA-256: 93a0fdb618c0e2e5a761a77c0c8bc2b92e10702501f3a43f1319528af7a398ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

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://nomylo.ru/uplcv?utm_term=aravinda+sametha+movie+online PDF link annotation
    • http://saluteebenesseresas.it/userfiles/files/43293710293.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/17665512617.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af0a08e144---26224359590.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907005204500031.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/13194689264.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/69104759024.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/5083449861.pdfIn PDF document text
    • http://darec.sk/files/files/ratufatir.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/dategubug.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/13119789004.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gelasaxezoxiror.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vadefo.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/61869376835.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141af83b8cac---79993685444.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zokadavipigemazog.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/16313369092.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xobubewonunopike.pdfIn PDF document text
    • http://vejwun.cz/images/78398958423.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/kutogemivuvexowa.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/jemenirizapepibuboxibo.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zowuvemuzeronamanavod.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210909071307.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/44443359883.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_off0000afe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE6 16632 bytes
SHA-256: 95fa516c41f2b0dd210b5697e39847801a752ebfa0abbeef73b5aeea19ebb890
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 10560 bytes
SHA-256: e7d8e71e855403191c9d7494ebb4363875b5b51d5217defc1d33648f790441ab

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