Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1fe0c41d1b65b0…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cab2e37f7434048a0068121da7cc97b SHA-1: 4ba66e4964e2063960db5e7892d2d77bebfdb008 SHA-256: 5c1fe0c41d1b65b0e4c2b1673e24281884e8b1b7288a6c93547aee977d1b210f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF SEO Disposable Link Farm heuristic further supports this, indicating a pattern of using disposable hosting for multiple links. While no scripts were extracted, the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://absolutelyneon.com/userfiles/file/83016219833.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/19211072120.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/99433037115.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109040234324502.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/36247053468.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/vawefakipegewazaw.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/levofe.pdfIn PDF document text
    • http://offerparts.com/upload/files/pepuvudovitemuzegodagi.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/tajosuzakukavozu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138115335c54---gitexunageragosepimipuw.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tamokote.pdfIn PDF document text
    • http://195exim.com/datas/files/71099185417.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/satifojugawubupar.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zajemusikuna.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021911637416002.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/2588262267.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/98544456951.pdfIn PDF document text
    • https://vitanov.rs/files/36252463317.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090310200373499.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/2030553105.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66475219599.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/jerevijusojoxakinidoval.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/52814789158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+factory+reset+a+samsung+android+phonePDF 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_off0000b880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 16808 bytes
SHA-256: a547e45a277536e708322df193d3f0465166efe3324d7ccc64e1bbfa24ba0a27
font_02_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 11312 bytes
SHA-256: bccb8f2780fbd6a31aa8be11908dfe0347db13c2eb51b796cd1169c07987b322

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