Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e931c15efbfb2cb…

MALICIOUS

PDF

90.3 KB Created: 2021-09-09 14:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d65faf9326ffc40a8f1869afe3e519ca SHA-1: 6212f5ad1bc8641f1436d500263b3ed6d558f457 SHA-256: 9e931c15efbfb2cb5e6244ebd062a7a55a771e9acaa340b6cdf602a2250ad1cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of numerous external URIs further supports this, with one specific URI being https://medvor.ru/uplcv?utm_term=tmj+and+dizziness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=tmj+and+dizziness PDF link annotation
    • http://portaldo.eu/contenuti/upload/file/rajamoxam.pdfIn PDF document text
    • http://servicepapik.ro/files/59813099374.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/rirexixinejemu.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/pobunow.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/46990500661.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905121724.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/50395580200.pdfIn PDF document text
    • http://azizolace.cz/images/file/xebizu.pdfIn PDF document text
    • http://quetthe.com/upload/files/mapor.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c2896d4117bb582613de6ed72a3e4e8/fejume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300aa56aebe---50433006189.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/30220108661.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xosopus.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/30195272829.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kidufuxapodamowo.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/29146348456.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/lezegidagig.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/42113856398.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gesaboto.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/subalizuvi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///wobagukiloso.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/62329090389.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/11965538802.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/61485638246.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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10200 bytes
SHA-256: 297fc3961ec3af00362e69f962d737580097556764f74ce4d8309f55792222d7
font_01_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 17952 bytes
SHA-256: 52491363db2524837308a73392fb6f3dd513830811d09ece7bdbf5498a69a27c
font_02_sfnt_off00014401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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