Malicious PDF — malware analysis report

Static analysis result for SHA-256 638e8026703389ff…

MALICIOUS

PDF

88.3 KB Created: 2021-04-23 23:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 95cc3d10482e844ec17866e73b0c744f SHA-1: 705c96133dd6a8e9e3b7c9b8ec2407373d1f2390 SHA-256: 638e8026703389ffa070589d026aa4f8965e54295eef8be28a4fee9a777faed8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=what+is+guerrilla+warfare+tactics PDF link annotation
    • https://cdn.sqhk.co/kibizatududo/bNBggv9/nyan_cat_lost_in_space_apk_download.pdfIn PDF document text
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/841591.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/0VVjiHO/download_restaurant_tycoon_cooking_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/jhigcge/muxet.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/eZ4jjgl/final_fantasy_7_remake_walkthrough_gamefaqs.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/fosuxozisimamub-zowosotokesuv-xanuxar-dulozidiwur.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/c0jcjjJ/santorini_greece_weather_in_may.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/j4bgggi/3607642651.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/siaHjhs/battle_proms_discount_codes.pdfIn PDF document text
    • https://gorenusedom.weebly.com/uploads/1/3/5/3/135326887/2c942f40e7abd47.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/gU7wptP/hill_climb_racing_2_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/gdijaQn/fuxefonose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_94c9cc1381aa48f78f6ef4f2ef33d115.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/jonevevimoje.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/event_coordinator_interview_questions_and_answers.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_e3082f1bf9a44b5087329aa8dce15958.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0601ec-fad2-4687-be7f-77a4136e51e9/17273008422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93494302-46fd-405d-9529-e9383c263b68/bivir.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/what_does_the_bible_say_about_reading_gods_word.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/conjunction_and_but_or_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/form_n_xin_ngh_vic_word.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_c58ee0cf59e145fca954f90b9f0fa948.pdf?index=trueIn 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_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 5248 bytes
SHA-256: 92945953e4aac15c8c88dd9575670d527721d4d8461f65ae56d82e341c767516
font_01_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 12176 bytes
SHA-256: 3a98038d39bf074000e90aee793dfdd7f216b0edb9db07c8d3a271483829c99e