Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccc636c42e888a7…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 03:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d061bcb7bf4de604b7a83eaa9cb66f SHA-1: bd36fb112d73ec80338d54cc6d7f7884afc1e701 SHA-256: eccc636c42e888a7da6afbb8be4040a56e0dcbd3bfada5e1a273ce1f430bf01e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary URL, https://ponafet.ru/award?keyword=christmas+carols+piano+sheet+pdf, is presented as a resource for sheet music but likely serves as a lure. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, with one example being https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_a52bf697be714757bb96af82c32ea7cf.pdf?index=true. While no scripts were directly extracted, the nature of the link farm and the ML classification suggest a malicious intent, possibly to distribute further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://ponafet.ru/award?keyword=christmas+carols+piano+sheet+pdf
    • http://deutschebank-meine.com/mr_heater_repair_manual3730q.pdf
    • http://luminar3-download.xyz/13256385436nh4g7.pdf
    • http://ketousa.site/wagomilelsamjb.pdf
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/zazizoparipe.pdf
    • https://jewuvasoseximu.weebly.com/uploads/1/3/4/3/134355154/zupinako_zimefurafigo_tuwobe_jozogiralepuma.pdf
    • http://lienforkid.com/caponata_de_berinjela_feita_na_panela2xy0s.pdf
    • http://khanapoorti.com/keurig_2.0_regular_coffee_machinegyab4.pdf
    • https://vetazewufa.weebly.com/uploads/1/3/2/8/132814418/520179.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_a52bf697be714757bb96af82c32ea7cf.pdf?index=true
    • http://nabasuxogakuwet.epizy.com/banff_tourist_information_centre.pdf
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_af8f90c687474dfa9dd1560fe9ff8eca.pdf?index=true
    • http://jesuwipefeg.rf.gd/xukubobelobiwuvuso.pdf
    • https://s3.amazonaws.com/piwanisaj/54690911191.pdf
    • https://s3.amazonaws.com/fusopoxipo/71184759078.pdf
    • https://s3.amazonaws.com/laradusa/32627873423.pdf
    • https://s3.amazonaws.com/lofese/directsoft_6_keygen.pdf
    • http://vaxalisuj.rf.gd/how_to_draw_a_dog_head_cute.pdf
    • https://s3.amazonaws.com/pirosisob/hillsborough_county_schools_report_card.pdf
    • http://fetufebutegiv.rf.gd/air_breathing_engine.pdf
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_172ced8df99e4e399f1b9d6244353c79.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_da3d9dfa3bf045b2995f5dc3749f29d2.pdf?index=true
    • http://mesuwepuru.epizy.com/57050454530.pdf
    • https://open.spotify.com/playlist/3d9shDrzUzRREWXxpaLyUo?si=tGlZI6OeRi6y_YhfWMuhqw
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e987.bin
581db094c1246777cef3becc9fc4981539dfb21c37a20d9888877442e5554979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 5300 bytes
font_01_sfnt_off0000fb55.bin
722c211c0f20c383620b148373d8394eaf3832dee571b128bec9116393f410e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 11132 bytes

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