Malicious PDF — malware analysis report

Static analysis result for SHA-256 2180096e598734ba…

MALICIOUS

PDF

77.4 KB Created: 2021-02-28 15:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a32addda6d9af83f2a8287f8ea847308 SHA-1: 420b320d1492e638ff4eb6d36aced719df2b6c34 SHA-256: 2180096e598734ba02bad8657984f07d5377539f9b75ea288f22beb41a5f5576
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains embedded URLs that redirect to external sites, one of which is a link farm hosted on disposable domains. The document body, though partially corrupted, suggests a lure related to book searches, likely to disguise the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=john+grisham+books+set+in+ford+county PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369168/normal_5ff32f7d8808f.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/gj6xW6L/nufokawofaluwiluvin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373259/normal_5ffc00f11f316.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/6vGnNVS/crazy_car_racing_3d_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_6034bf3cad436.pdfIn PDF document text
    • https://cdn.sqhk.co/xilobotinisi/jQjajbB/leap_day_birthday_driver_s_license.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408595/normal_603035b0bb7b7.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/ffgeThb/vikusizidilexepobatotefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_60364dfcba581.pdfIn PDF document text
    • http://bigakeka.iblogger.org/maths_formulas_basic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezajezo.epizy.com/sipiju.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/amsterdam_stag_tour_guide.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/mafawopipatojenare.pdfIn PDF document text
    • http://jiliwajomagob.rf.gd/sso_id_ki_full_form_kya_hai.pdfIn PDF document text
    • http://pebulibupa.rf.gd/impossible_year_sheet_music_piano.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_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 5700 bytes
SHA-256: 2de2edf9c503ca0e812780b4bddf8662fbad0cd7dcecf6cb29c571022ea8c1d3
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 10824 bytes
SHA-256: 9aacb5b16d738873692d6429a57bd3bc3d1f333c2a794541f9e474adc8d83d3b

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