Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d774d6285a5c5be…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 20:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a9219c78f5be02c4e76cddef34d1cb2 SHA-1: 8652097a40a502e5fb0201076690d397d02a2d42 SHA-256: 7d774d6285a5c5be5d1e48a3c011d161d8f74513a9f8d5607fedaa35f1f74d2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics identified the document as a link farm with numerous distinct hosts, suggesting a phishing or malware distribution attempt. The embedded URLs point to various unknown domains, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://anhuifan.com/upload_fck/file/2021-9-5/20210905181000203408.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/34276973383.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/gelizozukatizavebikikeja.pdfIn PDF document text
    • https://ksboutlet.com/file/files/35709852914.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/55018696858.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/69619921589.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/51584070982.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/bubokogogenupapadaweti.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/vofewolujov.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/51330209815.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/52810060622.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/6201383764.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f956279df0---bibofunaxotid.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/xidexebunot.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/jotuzego.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/27807144354.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/70585179250.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/dilavagu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/75c3391c3ac14678630944089aae6a29/69241855295.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/bovulimapafatilajimotig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=share+my+phone+screen+on+laptopPDF link annotation
    • 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_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 17472 bytes
SHA-256: 344a9cd9f6a2c6137fb2550558152a7702fa9e0cea0bd9c2ff208e14838d1697
font_01_sfnt_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10736 bytes
SHA-256: 921c7faceb3ff412962f13f2c99c399aaf6eccfe6c3f7b1ca466ad2580f7bd31

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