Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1d93c31dbeeb30…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 08:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c58119862484ffb228a7887bd6d8a29 SHA-1: d62d5b3a8f484652da5553f8485ca617198c21d2 SHA-256: 0a1d93c31dbeeb304aaf076d7f4e130c351b0223e3d79092850fdb2afc32ce38
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://lozipotod.ru/strik?utm_term=pdf+form+calculation+script PDF link annotation
    • http://lololoj.sportsontheweb.net/97247699367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_60145dd738002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_6024761438f14.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/VShhcje/liverpool_tickets_craigslist.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/i2haigw/remove_ring_curse_divinity_2.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/iHxChhx/pandora_radio_free_music_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wakagita.rf.gd/69618724251.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/caverna_dos_sonhos_esquecidos.pdfIn PDF document text
    • http://taxowojo.epizy.com/24025952636.pdfIn PDF document text
    • http://porininiji.epizy.com/fila_size_guide_korea.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/piwoxamesum.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/91927642656.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/world_history_project_based_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/bonds_payable_classification_on_balance_sheet.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 5300 bytes
SHA-256: 9c265d2f055d495a26d1a7d37d8d2f4bdcafe158546b25a89eb03c194ee3d56b
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 11040 bytes
SHA-256: 7db6198df4bad6e9fea6117b71f8322503691c285324f7b3e909a650421cf538

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