Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a226ab3b9d17fa…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 22:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3fd47b546d6f124554fb8d605caea75e SHA-1: ba2cd151274a31ea2f7db2241c8d7935d61fe938 SHA-256: c8a226ab3b9d17fa6e17f0e18700c756ae9eeb0a283194f67ca476c6da9d0287
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct, low-reputation URLs strongly indicate a malicious intent, likely for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://queure.ru/uplcv?utm_term=indiana+jones+and+the+temple+of+doom+full+movie+watch+online+free PDF link annotation
    • https://beauti-full.ru/uploads/files/71241671094.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/91762683590.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/loxazejegupoxasogut.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/7260578820.pdfIn PDF document text
    • http://sbairs.com/datas/files/92875021429.pdfIn PDF document text
    • http://plise.org/userfiles/file/9739811885.pdfIn PDF document text
    • http://trieuduong.com/images/Download/22410816417.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362eb8412f2---kafosabagivid.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/54035636102.pdfIn PDF document text
    • http://wirheiraten.de/images/file/rufisujevirodu.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dakuzenotaxaku.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/15550583157.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/15722831082.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50970384549.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/ladomosizorodokorawara.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/lawixizatodokosotedadu.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/73459668317.pdfIn PDF document text
    • https://betsin.org/userfiles/files/66434095157.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/26336706996.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/8850774685.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/ketoxaduweg.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_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 16208 bytes
SHA-256: 0a7bfa237d7d96ca3bfcc98bf3ab0fc32e2c2e33663667068d705cd43206dbcb
font_02_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 11220 bytes
SHA-256: 4259e151dee481557d74e0f6e9433c241674c75d6c7b8226d916d89fef34bbdc

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