Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f1ae757ddecad6…

MALICIOUS

PDF

100.7 KB Created: 2021-03-16 21:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b1864591b6c6ac35b23da656be73eaa SHA-1: 7b9c8ea3adf3054d87980ef6413fb5dfa9a51a15 SHA-256: 82f1ae757ddecad6de6bf1cc1196135251bfcee93887e387be2333270f11f524
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=cancer+de+pulmon+pdf+2020 PDF link annotation
    • http://buledumemo.iblogger.org/94435521794.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/6bhdqgj/raid_shadow_legends_add.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/ihhjgk2/linanowivovos.pdfIn PDF document text
    • http://muduxigagajixe.22web.org/47371785540.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/djfmjcf/betuxopowovesapus.pdfIn PDF document text
    • http://polibesafonujof.iblogger.org/best_online_converter_to_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/4gdrojf/the_legacy_2000_apartments.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/hhtKaow/boom_beach_hack_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/jgWidhi/jumemuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/gAmNZHU/3434965919.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/jNichRU/stick_fight_2_gameplay.pdfIn PDF document text
    • http://kotonopiz.iblogger.org/just_go_with_it_movie_parents_guide.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/87265604415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f23c4d90-dc82-4a1e-9e78-b298e9d11277/23587040382.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_2733ed0df5284c8b89a6a807e15f8db4.pdf?index=trueIn PDF document text
    • http://zumojuluru.epizy.com/71632364971.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_afa60d4b60774352b7a3494af0f367e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5374cb0a-31db-439b-8cdc-1393e929bbde/xedafeke.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_7e97afa1317c412bb3c4e1f44bc9691d.pdf?index=trueIn PDF document text
    • http://gilemexuwef.epizy.com/dewalt_dw734_carbide_planer_blades.pdfIn PDF document text
    • http://lekowezitodog.rf.gd/simple_2d_animation_software_free.pdfIn PDF document text
    • http://sidimusi.rf.gd/epiphyseal_growth_plate_fractures.pdfIn PDF document text
    • http://besenasoxa.epizy.com/foxerejexejigelizu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC8 5172 bytes
SHA-256: 893668d53098d6568f260ad49564a829326b3fa13e8193e7835150be5e51650d
font_01_sfnt_off00014e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E42 12340 bytes
SHA-256: 73978132618f984e9dd59b51dc604c06c1fde90038258a3e8dd201515de5253d
font_02_sfnt_off000175d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e