Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe13b4c14e68e918…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 02:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27353b87150bb51d629df2c68002f370 SHA-1: a8ba2b6d9d30943fe64249d305101a61c01318ad SHA-256: fe13b4c14e68e918a3eb0ec30b9e1cb33465ea229849607c21c2b0e1020cf2e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hotelborgodeipoeti.com/userfiles/files/35777844031.pdf In PDF document text
    • http://maasmartcity.com/userfiles/file/3758188507.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/gekenixuwa.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/62350946578.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/66073799697.pdfIn PDF document text
    • http://apex-architect.ru/images/file/37269839013.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210912070510.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a085334aa2---13840882826.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/wawevugijirozuto.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/61847291620.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/23045553474.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/7095098837.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sawoxokebotuvibapozela.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/jifodapexa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ced55862cd---vibowaxodizuli.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/42608066581.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/26274147381.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/12472798025.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/98169393706.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/84632194657.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/38944467593.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/tebejerozajekoxaw.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26806090206.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kinawu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zewakalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=shape+of+rhombus+in+mathsPDF 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_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 18944 bytes
SHA-256: b87856e0a8badd0e90c855ab58681f8b382c737698aec9f9d0cdf94a870b1e2b
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10892 bytes
SHA-256: a494a44f32bbf1825220aa71be275f61fccabc2a84d184d95d6ae3b0d7a3506c
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1