Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b7d366a1320ba2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 10:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7b6721d74ff42897054bc211ff93612 SHA-1: 45cb8575bcea8482727f6c99e02883c256ab5e13 SHA-256: c6b7d366a1320ba20efb6b86a6809d5d653115735cd6c6d68a4c1c77a1b610e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable or unknown domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for delivering second-stage payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://valenciamaids.com/userfiles/files/76596128415.pdf
    • http://kencert.vn/uploads/image/files/82626226086.pdf
    • http://bielwod.com/userfiles/file/ruwukanif.pdf
    • https://studiovizia.com/webroot/img/content/files/tafefobo.pdf
    • https://bostoncake888.com/UserFiles/files/49229296468.pdf
    • https://windscrm.net/files/file/punup.pdf
    • http://polyalpan.hu/_user/file/89446320626.pdf
    • http://hitechdentalhouston.com/uploads/files/rojufot.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613a032c0d0d4---zutafebegegaxiv.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2e10f283---57787481319.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4306ff28---254311012.pdf
    • http://digifast.cz/userfiles/vilor.pdf
    • https://hediyelikhanem.com/calisma2/files/uploads/jetokedikeve.pdf
    • http://mgtofubbq.com/uploads/files/minub.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_150035.pdf
    • https://camgloberealtor.com/userfiles/file/tujakojipobogumowuwode.pdf
    • http://aj-freight.com/ckfinder/userfiles/files/81383659048.pdf
    • https://manuscripthandler.com/userfiles/file/84368381039.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210904162725.pdf
    • http://artin-intranet.com/ckupload/files/weluxuvotizenotuxugutifit.pdf
    • https://hilanguage-com-tw.triangle-design.com/files/80654831913.pdf
    • http://baovecongtruong.com/upload/files/kuteto.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chandni+chowk+to+china+full+movie+gomovies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b364.bin
24f0a2b55942c5de270dfacab144833dbe7eef6124417daf7ccc3a016b7343b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 15692 bytes
font_01_sfnt_off0000db74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 16792 bytes
font_02_sfnt_off0000f38b.bin
bfa1ebcbec7db831a9254d770942cefa411ba8312c7d0f7fb876dfbb9af8cab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 11196 bytes

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