Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54351b3ad3f814c…

MALICIOUS

PDF

83.1 KB Created: 2021-04-21 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a15cf23c9b5d002ca8a8a0cdd5b5f0df SHA-1: 519721719d4beecbe9a9553dd1f98b7e95117154 SHA-256: b54351b3ad3f814c6d3f14ac360e1845155c10088f79b4c1afb71f167029be94
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a tracking mechanism often used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://golowaki.ru/strik?utm_term=awesome+band+2020+mp3+download PDF link annotation
    • https://cdn.sqhk.co/mudixeguda/egNRjg0/just_to_be_me_rhymes.pdfIn PDF document text
    • http://immortal-sho.club/free_online_property_valuation_reportfko94.pdfIn PDF document text
    • http://silvanozito.online/30479873844wyyp9.pdfIn PDF document text
    • http://bettermoneytips.com/77533484839ie2wn.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/ehgjggf/bloodborne_pc_mega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_6062e42a72114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5ff776c76043a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_60353284bf8c2.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/gidggic/zezemi.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/after_effects_complete_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/W17je1S/digital_marketing_strategy_framework.pdfIn PDF document text
    • http://1fps.ru/kexefo8b6x3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_6003acb810834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_601d063c9bb0b.pdfIn PDF document text
    • http://varietystore.website/57322194136jbkfa.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/aptitude_questions_for_cat.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/2932876056.pdfIn PDF document text
    • http://copyrightproblem.com/kapufepates57fq2.pdfIn PDF document text
    • https://cdn.sqhk.co/nibugikik/iidNlGu/astrophotography_pixel_apk.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/64497803-56fc-423f-95b9-f5f32ae1310c/a_peoples_history_of_american_empire_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd70761-e84e-4b0d-beae-6acf6deede6d/international_journal_of_traditional_and_natural_medicine_impact_factor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39db62c7-3487-4dd4-8e91-d661ef4b1441/76010763083.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 5668 bytes
SHA-256: d6ea9ef054ee44e9bb6b4ef16219e5cdcb98415de4b7084784a49bb45a203cc2
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 11812 bytes
SHA-256: bcd039e4a44ff0373c1c03aab1f106a8661e06267119d909e3770be9c7906814
font_02_sfnt_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b