Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5563e25a7d69f90…

MALICIOUS

PDF

76.5 KB Created: 2021-04-05 09:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6480b51718e19712cbb5c09cc7db19cc SHA-1: 212fd0c0e6a6e32b71b07e1b88fbe3875b4bbeec SHA-256: e5563e25a7d69f90a7fb3ceb257a6036a1bf061b128581b5908515138516e7ac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a mass of external links, with the primary suspicious URL being https://golowaki.ru/strik. The document body, though heavily obfuscated, suggests a lure related to learning tai chi, which is likely a pretext for phishing or malware delivery. No scripts were extracted, but the presence of numerous external links points to a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=where+is+the+best+place+to+learn+tai+chi PDF link annotation
    • http://bunagutafa.getenjoyment.net/iphone_app_convert_webpage_to.pdfIn PDF document text
    • http://nusezuretoti.scienceontheweb.net/soal_barisan_dan_deret_sbmptn.pdfIn PDF document text
    • http://chtotakoeverti.biz/kowopodanivavaseigvij.pdfIn PDF document text
    • http://business-open.online/68649651627js2ri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52143c55-3f65-4f51-9ad0-038e7b0543b7/buzodozoveratenil.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_93e3e06ac0294911a50ee82948223183.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/wumisuwulov.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_f2dfd88293454d89926f031724c82230.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojonuta/wefuxadozevixutovobifot.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/how_to_change_hard_drive_hp_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/vagifanitilituguzez.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/hillsborough_county_spring_break_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499a5388-9de0-4754-92fa-155ca2e36deb/royal_mail_international_tracking_contact_number.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/2012_dodge_avenger_sxt_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/speed_queen_repairs_johannesburg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651db3bd-0dab-4680-a7b2-367f12b64cd5/how_to_teach_a_dachshund_to_stop_barking.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_caea9da8d9d045f0bc9bd9e94af2919b.pdf?index=trueIn PDF document text
    • http://tifavamifikas.myartsonline.com/magic_school_bus_castle_episode.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/85589217102.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/heart_of_darkness_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/how_to_reset_insignia_fire_tv_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/how_many_pedals_can_voodoo_lab_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c870f6d3-d329-4c20-8795-395548874d10/guvojujuwebe.pdfIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_6a80197c5a55489fa1e6f98ea5251502.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6364d70-c145-4583-8cc9-84a68d467ad0/which_oil_heater_is_best_in_india.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 5176 bytes
SHA-256: 79cf193788c6818d0b7de19867f6d699215d478012ba3ad63acd907ec61757b7
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 10176 bytes
SHA-256: 7d87a4f13b19b2f86ee334ce74aa2c998e7ccf85a1bf053af203d804a34df790