Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1c44b142f1870d…

MALICIOUS

PDF

88.8 KB Created: 2021-09-15 23:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d79d42fb3276a2cd03f8ef5dd3b85f2 SHA-1: 9c533ec7889cf62746aea7bc0db1c186852ffb8a SHA-256: fe1c44b142f1870d51ffda85b23a3a625adaeaf9e92125cbe1fccd347fe6e33b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://haohanlegend.com/Uploadfiles/files/55942325628.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/198572d2b6fb22f74cf0aabb479dea38/xifuxumebaz.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/79724374374.pdf
    • http://modernplating.com/userfiles/file/wanorize.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/56189796995.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/66615217277.pdf
    • http://sententtech.com/file_media/file_image/file/91346895686.pdf
    • http://silverspringabw.com/uploads/files/87514849166.pdf
    • https://akconta.com/uploads/files/togutetofimutalulomifi.pdf
    • https://led7.ru/file/modadalulonarizidu.pdf
    • http://conditum.nl/userfiles/file/gisaxexigipusabineja.pdf
    • http://www.centrosanmarco.eu/img/news/files/gasodexosadakodosavotudaz.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/tibakufadinavibobo.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/tupiputulix.pdf
    • https://membermimpi.com/contents/files/467529518.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f42df57---fuberisemexite.pdf
    • https://thebookonpersonaltransformation.com/FCKeditor/file/dotofe.pdf
    • http://innova-perila.ru/upload/files/66112022937.pdf
    • https://nicklason.se/ckfinder/userfiles/files/jakenul.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/89107092794.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/26013625408.pdf
    • http://hpcad.pl/Upload/file/tokid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jattmovies+chal+mera+putt
    • 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_off0000f091.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16792 bytes
font_01_sfnt_off000108a3.bin
fae4ac1ba53a965d875737da6da0699fd577e0f4ea7ffe52c4a0615a3198e25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 19764 bytes
font_02_sfnt_off00013d10.bin
c840d009431fe71e3e3c025191cc20ca34417e293d62d3cf930ec1d66281b235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D10 10692 bytes

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