Malicious PDF — malware analysis report

Static analysis result for SHA-256 db105b2735f22c63…

MALICIOUS

PDF

94.1 KB Created: 2021-06-07 12:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b473d9d42b74e99c1cceb360ce1df68 SHA-1: 09a66f383e8212791d62a1103c1260773e29cf75 SHA-256: db105b2735f22c6392227d9d20eea64aa6d718107c699010727d86305cc11f4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to what appears to be a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the structure and heuristics suggest the document is designed to redirect users to malicious sites. The embedded URLs are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sugulidan.weebly.com/uploads/1/3/4/5/134508933/poxuwurebo.pdf
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/kavixoweg_zofamozi_rovowoga_funemefaroloxe.pdf
    • https://wetagazikizofab.weebly.com/uploads/1/3/4/5/134590768/wuwajuwatodeziwo.pdf
    • https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/vakepuxipebar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=how%20old%20is%20the%20oldest%20egyptian%20pyramid
    • http://jobagej.pbworks.com/w/file/fetch/144668781/dujawapafasig.pdf
    • https://uploads.strikinglycdn.com/files/1ae1b284-8956-4eb1-98fd-51f96a29f9a5/circle_theorems_gcse_non_calculator.pdf
    • http://tujezowosop.pbworks.com/f/internship_report_sample_administrative_assistant.pdf
    • https://uploads.strikinglycdn.com/files/10f049ef-7aeb-4c82-8d1f-b3e4ae230a97/moto_g7_update_android_10_india.pdf
    • https://uploads.strikinglycdn.com/files/1b55c368-ad4d-4641-91d7-185ea92fff1c/what_games_work_with_ipega_controller.pdf
    • http://lodenapokot.pbworks.com/w/file/fetch/144626190/how_to_program_my_cox_remote_to_my_tcl_tv.pdf
    • http://noxiwako.pbworks.com/f/27531910920.pdf
    • https://uploads.strikinglycdn.com/files/814d0d2f-4967-4891-a684-eaea9ea84681/41967687676.pdf
    • http://kigemulu.pbworks.com/f/tefelavitasikureredo.pdf
    • http://nubuzefi.pbworks.com/f/35595429501.pdf
    • https://uploads.strikinglycdn.com/files/bcfb3225-bb85-4dee-8e08-ad304f73bad1/7808632715.pdf
    • http://sovafiben.pbworks.com/f/physioex_exercise_8_activity_4_answers.pdf
    • http://misabovu.pbworks.com/f/manual_dos_padrinhos_marsala_download_gratis.pdf
    • http://negaboxa.pbworks.com/f/how_do_you_get_fortnite_boogie_down.pdf
    • https://uploads.strikinglycdn.com/files/96aaf71a-9b17-4009-8ba1-56b853d26af1/excellence_punta_cana_vs_excellence_el_carmen_2018.pdf
    • http://gajufabeke.pbworks.com/w/file/fetch/144755286/64340171194.pdf
    • https://uploads.strikinglycdn.com/files/1c8aa9de-c7cb-4b94-b0f6-b05bb5eb7dd0/how_much_does_a_detective_make_in_ireland.pdf
    • https://uploads.strikinglycdn.com/files/9f7ad9b1-74f9-41d5-b463-15b2d332c05b/95529254852.pdf
    • https://uploads.strikinglycdn.com/files/e359cc02-869d-4de3-a58d-9472a4a814f3/focusrite_scarlett_18i20_3rd_gen_review.pdf
    • http://lugozamuxika.pbworks.com/f/2530776115.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132d3.bin
e22cbf0feceddbb56ae933c7c8c4f56d87ee02a86dc981463ddc078f301e747a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 5528 bytes
font_01_sfnt_off00014585.bin
a98f61313d9632285d06926ab0fbf55ee2fd0615a1bb02e9218c6111cc17a70e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14585 11040 bytes

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