Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c671109072085…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 18:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd16c7de2935cfa19a81073f5026713c SHA-1: 441aa8192a9e69c242da7603f8eca3e7994d8b67 SHA-256: 6c9c671109072085e062436607c873f2be6ce619d190bf7e98cd8b4fb0645c06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

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 https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/43754122140.pdf In PDF document text
    • http://systempro.kr/userData/board/file/45359280033.pdfIn PDF document text
    • https://vitanov.rs/files/37508629339.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xobujowidofolol.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210905130905_hny615.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed410f522---zogodi.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/duwezoparazaverejinilu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/vugumeperit.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909091421169997.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/80931740602.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/27723129941.pdfIn PDF document text
    • https://cmf8.ir/data/file/jomutisodetuboxuwo.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/40635821060.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/11501371081.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/61818774826.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gulufunop.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67204119228.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/79886851040.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b799b71e09---livosajatixatavosilenuxug.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/30450699425.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/luzen.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/22760176104.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/tisifijinemumoxama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=new+version+minecraft+apkPDF 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_off0000bd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 16092 bytes
SHA-256: c656bc5c7931d94350dd1742ceee963ac8374774e20f728ce8a20da73b72aa8f
font_02_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10816 bytes
SHA-256: bdfde21c3bf219c24e1eb88fb4fd61a62e3c6131c8915aad0b8356b02a52da14