Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bba4aaa6caedafa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 06:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b31bd9a4a3a229924432087e901010c SHA-1: ab9b3b69ffcbf646dc07fcf94a47beae6d157321 SHA-256: 3bba4aaa6caedafacef2114cb55379900c26f0370a6e0a7e20cd1be7d48b1897
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://sujatasfoodopolis.com/ckfinder/userfiles/files/wabudekesafifafeguluzero.pdf In PDF document text
    • http://axiomestates.com/userfiles/file/tipagixovak.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910537449150.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/nedafowep.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/395178873.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/tupavubesozu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/fawabedexot.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133550cb92f7---50874601265.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/tibowoluxudaj.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/23799168431.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631142981.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/15757890199.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/80852374534.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/38673808580.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/97175454405.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/29134258947.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/dazizepamanifi.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/44985191272.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/xitijubosovidug.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/dugedogof.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/fotupaguperexuwo.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/17852678619.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/sapifisixivu.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/65776903862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=top+free+game+for+androidPDF 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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 10492 bytes
SHA-256: c58bf9c0b2df8f64689ed98306dbf9159087c8f1305e95dcb001808f980a8cd8
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 17632 bytes
SHA-256: 5f3a3e7d6fb70711c5d5d30eab6fc2b4b12536fcb7f4e4ea2fd3d3df84bf698f
font_02_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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