Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c59144efd2c9904…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 11:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cb250a333a86673f2d358c5ba8dd55c SHA-1: b61d3d98c3b5dcf88d8f86e78199a72688c2e0b0 SHA-256: 2c59144efd2c9904cf578da33ca05566c67d21743a96efee603ef4a5d0841406
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34ccfd78bdd76ebcad008d2715879c9d/bobab.pdf In PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45579862753.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/mowasobojunupopiwegonami.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/52722783114.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/numasekarud.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/diwiviresesofakub.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/40529407965.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/xijumexogasokisanuvuzezis.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/20749654728.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/63927354583.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210905131242070220ek09a7.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/52818390185.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pobapesa.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/punametibubufitaluze.pdfIn PDF document text
    • http://groupkaishan.com/d/files/sumixediwoweniwanudibug.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/woror.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/jixizonen.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909115844787040h3yzt.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/nafodor.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/kizunox.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/madovareliwi.pdfIn PDF document text
    • http://esistore.de/userfiles/file/sosov.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/9953273344.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/19953869632.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/lanujep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=grand+snow+excavator+simulator+road+constructionPDF 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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 20580 bytes
SHA-256: 96268239a1750d7f6056d1d468f4b9568e17ff1d2958edaed9afde29277805d7
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10924 bytes
SHA-256: 6b6ee8ef5be8abc8be27ca2c2650df82cf462b611d4ddb55f6d4893a95353700
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.