Malicious PDF — malware analysis report

Static analysis result for SHA-256 992d4d46c74f4091…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 23:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a25396bf240f7731532ad9f220263676 SHA-1: ea2142408bb6cb52e266da3b1ffd0153442c743e SHA-256: 992d4d46c74f4091df49cbaf914c18170d7cb47d858159bcb23f0be386739c65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=e+major+seventh+chord PDF link annotation
    • http://orikon.net/Images_upload/files/buxakekusumim.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/jurodabesedebunodupezebip.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/40690119641.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/2926470004.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65079778509.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/20709416176.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/48972348069.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/wosawe.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68857311304.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e4a8f453---guradipuzosasideve.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/21221741997.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8103a51f---bawexajezilet.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091019225140.pdfIn PDF document text
    • http://ahchala.com/img/file/nonuwepilominubaxi.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/zudaremurajokix.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/29792877871.pdfIn PDF document text
    • http://teakdeck.pl/files/file/kifosejepav.pdfIn PDF document text
    • http://exosushi.com/uploads/files/mudixuposoru.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_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 18008 bytes
SHA-256: 7f1eee28202ce3e3f5423226258914032def3f08916bdd49ef79cb729acdc6d6
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 10676 bytes
SHA-256: 4bde5dbfe915e8719c101ff10c233ced633e22f4864fb9b9f1af421278965f61

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