Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6917b691053893…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 13:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a75f7e1b556427dafc7aae4fd84cb73 SHA-1: 6a699357686b940aa8f4a5eba502ed3e836a725a SHA-256: dd6917b691053893fcab418282a51ddb1b758f129eff13c6395748846f2f6896
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bestpokeya.com/uploads/files/88971523430.pdf In PDF document text
    • https://atiksigorta.com/files/balilimipoxisubox.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/85645786864.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/96020335463.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/tanodusolotiku.pdfIn PDF document text
    • https://network-italia.it/file/77806677105.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210911003453.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/telal.pdfIn PDF document text
    • https://bolahijau.com/contents/files/rojobo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392453a6818---fukogowutoratumo.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wifemubofemudubudutux.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11687551183.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/52272224765.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/tijosedusogufejamaz.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/60896931365.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/86013697677.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/fabafigox.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/07e601f80c327fb5062793872c472a2c/wafusoderokubivekoz.pdfIn PDF document text
    • https://aksusu.com/upload/files/remupabak.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64594620306.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/91157561637.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/1032349913.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/metumutamuvigaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+remote+control+linux+desktopPDF 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_off0000b037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB037 18232 bytes
SHA-256: f45f3abcf8cd72d6451a378c379002e99c5a781e9fb8504ef4a5f60bb140d757
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10788 bytes
SHA-256: a10d3e7f44de70b2d74511c33dc89902a56b540a9d9753aa9429624872e02a93