Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59b2bee6a0879b2…

MALICIOUS

PDF

69.0 KB Created: 2021-03-19 21:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 97c8401b21ca322b2ddda9f2be33d74b SHA-1: 55e89ec7ab12c11ffc879f257371386564b9f27d SHA-256: e59b2bee6a0879b21bc12ba3804809933c08ee0af3c0620b985e9b23b7bc7855
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 0.9998

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://baarspo.ru/strik?utm_term=hp+officejet+5610+all+in+one+cartridges PDF link annotation
    • https://cdn.sqhk.co/modonasuje/he2JCGB/nefubasixitovolerog.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/DhiBpij/past_simple_and_present_perfect_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/jhKig9P/free_oldies_ringtones_for_my_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/eojbbjH/real_simulation_experience.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/fJxjbwi/mewam.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/riNvygi/black_coffee_increase_testosterone.pdfIn PDF document text
    • https://cdn.sqhk.co/jifonakilux/gghkgdC/mini_games_zombie_vs_plants.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/djjKifW/smash_hit_unlimited_balls_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WOau6sx/98013914884.pdfIn PDF document text
    • https://cdn.sqhk.co/dosiloxof/Okgg7ja/23176035408.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/hh5VgjY/rock_ringtone_mp3_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/gygd2jg/biribadupotorugaminuwebol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_bfd354651a11465c94a61454b5270c71.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_53ee7adab397419fb56d77356b62c2d9.pdf?index=trueIn PDF document text
    • http://suferipuwa.epizy.com/game_controller_for_android_phone_australia.pdfIn PDF document text
    • http://xubumanazi.rf.gd/17333413813.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_0345a1f6cb4f45ecb07107f58bdef967.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_265d793309dc4a9cbc262818f34d50e7.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_0c5e406b666d42f49161e3b41e01aa99.pdf?index=trueIn PDF document text
    • http://xodepew.epizy.com/leveling_guide_maplestory.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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 5832 bytes
SHA-256: c354e20d157c1675eefd102f49ab86e880624a5165d0b32824218dcc7c6f11e4
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 10456 bytes
SHA-256: a5269e82e3db071cfca25659ce7aed8f751321ec2bc0d6ac21aa2f7eb9663ec2

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