Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6de7f9fa14959c9…

MALICIOUS

PDF

84.0 KB Created: 2021-03-29 17:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a8e5b9244d79bea428f7b9b3bafcb4 SHA-1: ef3368332e310eee10e35debd442be813025a20f SHA-256: f6de7f9fa14959c9fbe32d4fecfa63b369258cc37d2f639d3aea033eb407c9d1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=energy+changes+worksheet+pdf
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/vojuwujazogotaxiw.pdf
    • https://cdn.sqhk.co/gexopoku/cjfhcNj/44453129872.pdf
    • https://cdn.sqhk.co/sarunasol/ijkYyja/76644981861.pdf
    • https://cdn.sqhk.co/dasupejej/ghthinL/30324617344.pdf
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/detiporetuvi_vawozakowon_netawado_rixebilonotuzi.pdf
    • https://nonokutofukidob.weebly.com/uploads/1/3/4/8/134872148/1892864.pdf
    • http://tonukavugu.mygamesonline.org/learning_opencv_3_o_reilly.pdf
    • https://kulitexujaw.weebly.com/uploads/1/3/4/0/134099612/9b973f41d57.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://koradanizepagow.myartsonline.com/rukaledepululitogoro.pdf
    • https://s3.amazonaws.com/turip/don_t_starve_shipwrecked_guide_reddit.pdf
    • https://uploads.strikinglycdn.com/files/79bc2ce2-26b0-4be2-a945-0309cb54f12e/top_down_vs_bottom_up_approach_in_network_design.pdf
    • https://uploads.strikinglycdn.com/files/0c119d30-6480-43c7-b8a2-2ddf0a0b8010/74743810367.pdf
    • https://s3.amazonaws.com/kakekojezutok/airplane_mode_greyed_out_android.pdf
    • https://s3.amazonaws.com/fejenijovekozu/what_is_a_software_development_company.pdf
    • https://s3.amazonaws.com/meludav/zuwekixevofobizejapuri.pdf
    • https://s3.amazonaws.com/wupuxus/39154020473.pdf
    • https://s3.amazonaws.com/tamobalasu/price_of_west_texas_intermediate_light_sweet_crude_oil.pdf
    • https://s3.amazonaws.com/bomifabipi/97856122972.pdf
    • https://s3.amazonaws.com/farowug/mevilizafonuvalalogas.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51d.bin
8fa46ec661faeeddee5bd750f842fcef941e8bcf87d3322ee599ecbaf0b9e681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 7196 bytes
font_01_sfnt_off0001077a.bin
14409315c88c28f46f5db39aee7bd319376679aaf9eef56bdc675fe46624c843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 5600 bytes
font_02_sfnt_off00011aa2.bin
571873c267935894b16551be1e4a6aa0c5b0e74843e97bbba643a842f33db6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 11556 bytes

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