Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7ab7b951660d52…

MALICIOUS

PDF

70.8 KB Created: 2021-09-11 19:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4e5dd305c089ffe273d9bccd284673e SHA-1: f220cfea37518ab794580f98d459be764a37df62 SHA-256: 9f7ab7b951660d52351b33eb6f965b5ad0c65f4fc9987a2117717ae92aa69ec5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://wastran.ru/uplcv?utm_term=glitter+live+wallpaper+glitzy PDF link annotation
    • https://terminarz.online/kosmetyczka/krakow/files/tigupalewenurogit.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1554753726131f43d0129a.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/70892999318.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/jolixesokomelokitipixo.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/10198747268.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b333b0db2d---xoreritanazelog.pdfIn PDF document text
    • http://someteme.com/archivos/_20210910024337.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/63447790439.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/muxinanizugojajuse.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/85886483474.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/86181427450.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/wizukakegovomakog.pdfIn PDF document text
    • http://www.moyekolodin.com/files/99602492293.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/sudivuvubiku.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/5854355392.pdfIn PDF document text
    • http://benly-carson.com/product/files/2696609386.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/zatavaxefud.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/laburamaxolifejudebe.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/16743101266.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/bologulemi.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/soxuxaxoxejuvazijeko.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/goxifosow.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/97947788663.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/32003016959.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/wedimunamigurujawul.pdfIn PDF document text
    • 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_off0000b40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40D 16488 bytes
SHA-256: 56fc0e94a3d589534c0616d536a0c9b0e905a35c7f7f1abb09c3a7ae6e4d00ca
font_01_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10400 bytes
SHA-256: c6fe3c634c65fbf1ec1f612ccccfa19de989a7d01f1a0f37f555a65bcb9de76b