Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d6eb297797cd75…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bee8323280442e7cf6a5c40c81a4786b SHA-1: 3ae107466a9746f47f83f5496f29405c0292adc8 SHA-256: 51d6eb297797cd751767fa4756074e80ba979d32578c7c9279599ee4c1f315cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, including one to 'queure.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the link farm heuristic indicate an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=you+listen+android PDF link annotation
    • http://yummyschool.com/_UploadFile/Images/file/70963380149.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/64696997229.pdfIn PDF document text
    • http://gdgom.com/upload/file/210923055208617523c3ffa6tifgc1.pdfIn PDF document text
    • https://baongochoa.com/upload/file/watavoziwina.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614249d076f3c---83864997611.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/jitogixojinedunabej.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/84357698288.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/77909254017.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a859a9bc0---13115420049.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/dedopidovax.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/vukabarawun.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/42790551362.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/figedipobuga.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/zizopapaxew.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/74806813677.pdfIn PDF document text
    • http://consade.com/userfiles/file/negijifinewinetuturoj.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/mejaligavaxemizuso.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zekujosapunepujejudaxiga.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/rubefewe.pdfIn PDF document text
    • http://arucax.am/user_images/file/levuteropax.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/sumedagidozifo.pdfIn PDF document text
    • http://spbi.cz/res/file/jegoru.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_off0000b5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FB 16328 bytes
SHA-256: 496c1250e218ddeb1555e966ec94999484844cc585426198104efcfbffcad61b
font_01_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 10324 bytes
SHA-256: 53ab783b67268fecab7871258ee70e76b1906d774894d61071964d4d109a6ab5

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