Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa8804551e69ba8…

MALICIOUS

PDF

92.5 KB Created: 2021-09-08 17:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b77bbccf994dec004cdce554c2d8228 SHA-1: 8da80bfa8a588d66619bfc819553ded2ca058d5e SHA-256: ffa8804551e69ba85d5b9661006dd463348723aa34f2a2edaee7512d24c52b88
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the presence of numerous suspicious URLs suggests a redirection or phishing attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 4

  • 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://baovethanglongmb.com/upload/files/totokagobavapulumezeza.pdf
    • http://schodylux.pl/userfiles/file/jedivonokekolenovo.pdf
    • http://leylatoprak.com/userfiles/file/49371573012.pdf
    • https://ww150004.linebot.net/upfile/files/20210903035206.pdf
    • http://rtm-plus.ru/ckfinder/userfiles/files/kuzitukuxelap.pdf
    • http://labonguyenhoang.com/img-chamthi/files/tesuniligibunovos.pdf
    • https://cplastik.net/data/cms/file/7328237650.pdf
    • https://hsse.cl/files/34188711565.pdf
    • https://protum.se/file/jurapugasesafer.pdf
    • http://joyearland.com/ckfinder/userfiles/files/46767976193.pdf
    • https://tyeetomsfishing.com/userfiles/file/ladukopisomujeloxixu.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/tokunimenazotugatog.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/41550841144.pdf
    • http://domusanna.it/userfiles/files/zobamuketik.pdf
    • https://kaparatt.com/images/File/66410632363.pdf
    • http://qataminational.com/uploaded_files/userfiles/files/48498631753.pdf
    • https://texigo.tw/upfile/files/2021/09/05/43978876603.pdf
    • http://www.siposferenc.hu/html/fuzomomuzo.pdf
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/xuzifezisefosokepozamav.pdf
    • http://honghuibio.com/d/files/rigupesixel.pdf
    • https://laptopserwis.com/app/webroot/media/files/bifumetimuxujami.pdf
    • http://tonwen.org/userfiles/file/16545429778.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43514740---42033447896.pdf
    • https://digireg.org/upload/komexefudejifo.pdf
    • https://successstudio.net/userfiles/file/numasekarud.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=customer+satisfaction+journal+articles+pdf
    • 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_off000101ad.bin
5103f18860d90d0c6c44fa6d914a6efaf546dbdc09c08d11986eb9770d0af672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 11040 bytes
font_01_sfnt_off00011b62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 16792 bytes
font_02_sfnt_off00013374.bin
5cda31d0d3cb06fdb1518e4cf646ccaea363101edaeac20a3a88da5953850d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 18616 bytes

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