Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffcd6babbbd45cd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 13:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cad19962c89786b23558b33c66fdeaf4 SHA-1: 6ed26c4ebcc28968ec6326a114b962a0be5238b7 SHA-256: 9ffcd6babbbd45cd7f3f98a69ddef76db1823e8415d741a2359582217be60a7d
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a potential attempt to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a pattern of using numerous distinct hosts for linking, a common tactic in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://makesrealsense.com/ckfinder/userfiles/files/95353060036.pdf
    • http://spiregene.com/image/files/20210904_135014.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/9534524907.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/rudajegovasakupuv.pdf
    • http://zjleiou.com/images/upload/File/86270085853.pdf
    • http://microcement.ua/userfiles/file/lotejo.pdf
    • http://ubest.ru/images/file/21395125153.pdf
    • https://wheelmartthailand.com/image/upload/File/naxubosegebor.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/82182687600.pdf
    • http://golfvillageonline.com/userfiles/file/67350283959.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f70ba9bf---71848380053.pdf
    • http://julianina.dk/upload/file/53628020597.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/58121300855.pdf
    • https://self-storage.sg/images/uploadedimages/file/fobukoxipanap.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/werexidexaranip.pdf
    • https://egf.tw/test2/images/file/matarikikip.pdf
    • http://1000projects.ru/upload_picture/file/kopuzesowakexaferadevona.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/60382023131.pdf
    • http://soft-pro.hr/upload/datoteke/xipumuxatevuvolewafivuro.pdf
    • https://inprovitchile.com/ckfinder/userfiles/files/4710772968.pdf
    • https://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdf
    • https://daqing-jewelry.com/uploads/files/202109060128413230.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+drag+race+down+under+free+online
    • 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_off0000db35.bin
681e4f8a7098c4ea1bc0b4e8fadef3d981d078b5c5ca438ac15f055125d91651		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 18244 bytes
font_01_sfnt_off00010b13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
font_02_sfnt_off0001232a.bin
e9d7313bf36102f08ef87c4f92fc6d4ba02454410ed86b44f94f2b89e1b72739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 10768 bytes

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