Malicious PDF — malware analysis report

Static analysis result for SHA-256 d842e5d0625d7ca7…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 23:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e319ef5bc65785b8b4378f9df170a85 SHA-1: 5668d764c6248b50b23128995835e056fe4325b1 SHA-256: d842e5d0625d7ca7d38fc93a8987245fa56afe08d22b0683bc1be60124b24695
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to `https://coretry.ru/uplcv?utm_term=best+technical+apps+for+android`, suggesting a lure for phishing or malware download. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports this by identifying the PDF as a link farm hosted on disposable domains, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=best+technical+apps+for+android PDF link annotation
    • http://goksirlambinowice.pl/img/upload/files/45614735204.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/nedetujusulelefed.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/14574605793.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7pv9gp056u1qj5stoclkbmvo2/gidojemixojetudidajanobov.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/nevogodiset.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/74641551824.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/42850690298.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/3225697953.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/rakutilibeke.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/putetuminokekurix.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/borejubefefuj.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905111031498.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/49643172928.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zaledesitotetul.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/rutob.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/57916402423.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/54783137943.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/50441953002.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/95780186874.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901230133.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_off0000ad2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 10768 bytes
SHA-256: eb021a866b56733323fe36674d05bcde962f0a089c32be9ae3c642ecdae77f11
font_02_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 15132 bytes
SHA-256: 3fa5a2f192510e57731acd67c0c7dfc06d8e8f736520d7e4f21481ed38c2a155

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