Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5d57b42bde8f7b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 23:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0e1bdbb89bd96d43f9b264fc6f75475 SHA-1: 04f67ab1915d1df2f89e79fcbb6a323e01f3a26d SHA-256: 8f5d57b42bde8f7b7f85904636281c54ee562290cbff217f5ebce4866e80cde1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF is designed to host many links on disposable hosting. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sivam.pl/files/file/4195920950.pdf In PDF document text
    • http://fcraregistration.com/UploadedData/file/29312008679.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/31854658252.pdfIn PDF document text
    • http://szcftz.com/upload/1973091102.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/99397773073.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/59919795686.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/dakukaxu.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/xomuzomojosipa.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zikanuzoxubowev.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/ferovojotoretefoma.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/280891152.pdfIn PDF document text
    • https://rotitelor.com/contents/files/denobototiliwi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/tuvegefabanuvalunojimol.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/47701994636.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/rexumewajiwimaja.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903054720.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/47776373285.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/14235334707.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/fopuxufapuse.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/35329816547.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/45574797160.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/83878524350.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/nefagobimilorim.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/wibuzadafevilafufafuxinon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=samsung+galaxy+pokemon+go+apkPDF 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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 10788 bytes
SHA-256: 218e968dbaf9a280435e1d011c866c07d5ad5bf1e2b7f4a099852f548b167ae8
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 16136 bytes
SHA-256: 956db8d8c1a95889116307312a32df3f8bd09d3df09ece39b6d5466b4bed48d7
font_02_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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