Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a756abc136de58b…

MALICIOUS

PDF

98.0 KB Created: 2021-10-05 06:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78cead3ccf24b67bb7f9a59f35dff556 SHA-1: 65d5b4115f8528340ff6a2532dd3fa9500b38b73 SHA-256: 9a756abc136de58b35406640d7a9122ee41eaa8f2ea56728a3ae9d3e59405806
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fullprotec.com/ckfinder/userfiles/files/zobitewanitoxomuxa.pdf In PDF document text
    • http://kengosushionlineorder.com/uploads/files/69645367543.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/86141751230.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kijukafileba.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/furomeliwakusuximadali.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/jowetepozusogiverexek.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90406058724.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/fibefujowikikog.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/noburoladulazakazoz.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/60244729431.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/xebop.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210906013520.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95941496439.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/nuwibibes.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/fijofon.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/2915833047.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-20/20210920153837626052.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/92309571066.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/52436147023.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/23739886036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=charles+dickens+victorianPDF 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_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 20408 bytes
SHA-256: 2ad1454e8a6b796a25dacd01ad8783a33a5b1a9e0be49e922764354f9bfd5d8a
font_02_sfnt_off000162e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E1 10656 bytes
SHA-256: 26b619e7719e9470cb9236aaa9c2c9ca5ad660969781e3839a1ea5b286a5705b

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