Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97ebabf10fadd8f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 13:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 512fed791b1f0f7efb5d050d15195529 SHA-1: 5926e61aa963c940fcd04dda40814fa0cdfc05a5 SHA-256: d97ebabf10fadd8fb7f1e19c21cc673b3109c5ac64c0ce0f064f6f5a74d39a4e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, one of which, 'https://ketchas.ru/uplcv?utm_term=login+onedrive+business', strongly suggests a phishing attempt targeting OneDrive Business credentials. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and ClamAV detection further support the malicious nature of this document, indicating it's part of a link farm designed for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=login+onedrive+business PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133e447a8f63---47998939659.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/ferukija.pdfIn PDF document text
    • http://normel.org/files/upload/file/zavimadujatugigisowunixe.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/rilejuxij.pdfIn PDF document text
    • http://boldogelet.hu/media/43459088484.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/82940172256.pdfIn PDF document text
    • https://semut73.com/contents/files/segek.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/fapoguxanixe.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/tewipugomovug.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911049154455.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/fuzunofiroguxojozofuxiz.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/1312613149.pdfIn PDF document text
    • https://comfort8889.com/upload/files/bafapogevuvagamipeliv.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/segevumifumekivefibigugew.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wavumezuforesam.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a630d987---wuwajeva.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/nukumodeta.pdfIn PDF document text
    • http://idcla.net/upload/files/15443431686.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/15632690098.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kubuxataj.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/58061478754.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/67219021992.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_off0000bc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC12 15560 bytes
SHA-256: 9b5bcf16043abb2c59dae7d8dcac64c4a4b1793325fc3706b12a109037c2c128
font_01_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 10380 bytes
SHA-256: 8c9e52d1afa475efad785a20eed67a43ba12786ea6330e4d8094d481ed80d723
font_02_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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