Malicious PDF — malware analysis report

Static analysis result for SHA-256 744735f12128b36f…

MALICIOUS

PDF

42.0 KB Created: 2020-04-02 03:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ade23324915f5ea21f043dc304fe4e7 SHA-1: 02d49fcb488feb44b354fc4de445958c1ee6dd3c SHA-256: 744735f12128b36f6a2dfcecabf286ed536fdfbee26ed022d3de3fffc4eddec4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs social engineering tactics, specifically a 'ClickFix' and 'Remote Support Lure' to trick users into executing commands or installing remote access tools. The document body contains numerous links to external PDF files, likely part of a link farm designed to improve search engine ranking for the lure content. The ML classifier strongly indicated maliciousness, supporting the observed social engineering techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://brianstraumaproject.net/uploads/1/3/1/3/131383760/131383760.html#onn+wireless+mouse+connection+problems
    • http://hmgaccounting.com/uploads/1/3/0/5/130589058/8072710.pdf
    • http://themahasiddhaandthemonk.com/uploads/1/3/0/9/130969774/823256.pdf
    • http://microsofthelpdsk.com/uploads/1/3/0/4/130476501/7f91918e51e.pdf
    • http://eatsleephockey.org/uploads/1/3/0/3/130379561/ece30b1.pdf
    • http://cornerstonejkc.com/uploads/1/3/0/6/130639461/4275792.pdf
    • http://ziplyfe.com/uploads/1/3/1/3/131398453/fuwexi-lirava-jawixofo.pdf
    • http://savitripersonaltraining.com/uploads/1/3/1/4/131437181/f1c4ad1f.pdf
    • http://malibuevents.org/uploads/1/3/0/7/130775407/53e69ab43.pdf
    • http://therestorationvillage.com/uploads/1/3/0/5/130551726/mateto.pdf
    • http://cxmockup.com/uploads/1/3/1/3/131379584/kowuda.pdf
    • http://crazecollective.com/uploads/1/3/0/5/130545753/dizefo.pdf
    • http://jdurango.com/uploads/1/3/0/7/130739564/dagokese_tuvajew_feketuduwuka_vodovojimomumob.pdf
    • http://costaribas.com/uploads/1/3/0/9/130969056/20006.pdf
    • http://summitapparelpc.com/uploads/1/3/0/7/130775336/metukonud.pdf
    • http://smuttynose-turnings.com/uploads/1/3/0/8/130874287/3f884e42.pdf
    • http://howe-online.com/uploads/1/3/0/5/130545800/tusavapu.pdf
    • http://jynsenhenry.ga/uploads/1/3/1/3/131398498/7888516.pdf
    • http://taxpreparationcoatesville.com/uploads/1/3/1/3/131382907/f338deac.pdf
    • http://libertygraphicsok.com/uploads/1/3/0/7/130739561/bb08e5dd5da.pdf
    • http://velascopressurewashing.net/uploads/1/3/0/3/130324164/povozip_wizuleja_mapoj.pdf
    • http://houndhideaway.net/uploads/1/3/1/4/131412426/8101509.pdf
    • http://hopeforhemlocks.org/uploads/1/3/0/6/130639739/jatetumuraj.pdf
    • http://guardwatchllc.com/uploads/1/3/1/4/131406847/fitoxina.pdf
    • http://mbpartners.xyz/uploads/1/3/0/5/130551427/4d821766a9d2.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b55.bin
a9dc345e67cfee842a197a2ec65fefed3da1479ea562307684e7ff0ae66805a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 7476 bytes

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