Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd56187c680f04f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 08:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 434fa5852f20cc1eb68f55e1a616513e SHA-1: 712de07136170ae04236cc3413ce753782cb3b87 SHA-256: cbd56187c680f04f6b82b0adfe9dd64cd901e1d618187e2b511e933389d56c4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or suspicious domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wlpp.net/images/blog/file/50752111283.pdf In PDF document text
    • http://baove247.org/upload/files/wefut.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/lamozidusutagexo.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///57329502942.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/8297160856.pdfIn PDF document text
    • http://insei.eu/userfiles/files/21582724261.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lexasosof.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/tosulekexasa.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/45384938171.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613BD1203B2E3.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/840776cb56c5b33f2e156f4e7354f047/zulepo.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ketitugejod.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/36108808422.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/sapat.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/bebawinuko.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/12878063656.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/putuwew.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/nunitiwetagi.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/mamovamojof.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/fikewiketoketizogugejetap.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912021010.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/nebobajuvugesewowup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=typical+leaf+structurePDF 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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16312 bytes
SHA-256: 72104a5e6b742fd443d887ca5eda45dd656b72514e01373c7a2203eee335a283
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 10424 bytes
SHA-256: 4f482692bfd2ee541713a93c9eff15b34d0b94b8dd5b67493489c9efe18a1005

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