Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae4066c0519e770…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adc4c1cbeb2fb135627c83efdeb85050 SHA-1: c6d1714b4c0ac3d10ccb6f94ab75ca6bc680713c SHA-256: 7ae4066c0519e7700ddcb0b265941523d9d68fed172ad3da4935481c66882b1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of many unknown URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

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://ecole.ru/text/images/file/75774535814.pdf In PDF document text
    • http://geoodwierty.pl/files/file/xozefunarigamesejunabo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/21667478659.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/65184948235.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/guwegedarediluwomosapi.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/zorun.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/fuwokijemumapozekalo.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/40237159111.pdfIn PDF document text
    • https://hssanesteban.cl/files/58018811618.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134c22f9703a---6952207326.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/mitexigabukepelavoku.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/73652372297.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4dee2f17d35429194f91f5c14f52b46f/vokewozomixizuguf.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/5572192525.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/lazofexudimezag.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/62815719383.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/60558518697.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/92654075464.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/23860753674.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jovate.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/11412493348.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/97692691955.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/zowebevinadig.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/masapo.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/wuguzetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+how+to+block+all+calls+except+contactsPDF 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 11012 bytes
SHA-256: db40249927120eea841d819ce6dcc5979cab942754b663a8f46b71fbff5e43be
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 17760 bytes
SHA-256: 9cc89a0fba666782e61cd9096f328d36d9e4279c60ad23381713ffadb5056392