Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9eda5540b2a5132…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 05:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bae73cbeea1ae8b2782f01f71c219d67 SHA-1: 91419e4576088e3e5f21d53d423fb9d59d312d20 SHA-256: e9eda5540b2a513239618fb290dbbc02773c670f3c8ddf06db15db348069ff78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct hosts and small PDFs, suggesting a tactic to obscure malicious destinations. The presence of embedded URLs and the PDF's structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8569

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://anninh247.info/upload/files/78143529302.pdf In PDF document text
    • http://chipgene.com/image/files/20210910_150836.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/28057374038.pdfIn PDF document text
    • https://www.aspart.ro/ckfinder/userfiles/files/zofejosudoluwarenesug.pdfIn PDF document text
    • https://partnermind.cz/images/files/niditamesuzugis.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/51153009813.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/626e4b423c4e0d472fced165c0098400/22515110479.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/22124828084.pdfIn PDF document text
    • http://hanauhrova.cz/files/59423021081.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/47228219617.pdfIn PDF document text
    • https://buka.ru/sadm_files/bobazavupejulimewatoze.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/6346655546.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/53442654103.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/90726136135.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9b8d117ee5a79d2e4466d1cf88cbbce2/tuzulujap.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/24121029311.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/warikirufafelegodusatu.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/xoxoluzobelex.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/78296867990.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/61560060380.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/15563009819.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/44794016650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+gran+turismo+6+para+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/2732161241.pdfIn 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_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 18116 bytes
SHA-256: 4271acbf51510082152a79086b4926454323769729ca0866a9327d269c750407
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 11080 bytes
SHA-256: 8d09e3db9af69753e75f71eb403f9707bd066d9ab9d1c56a16cbd4cf8011bf85

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