Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e65c4d7550547aa…

MALICIOUS

PDF

81.7 KB Created: 2021-04-23 14:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f92e67d3f0da59257c180ee5a7f48bc8 SHA-1: 3e5b4e3f6b81768c58e12cf3ed58d2fa93dd01b1 SHA-256: 8e65c4d7550547aa39eeddcb3ed152b5776fed6298152d6355b8fe1eb2817054
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to multiple external URLs, one of which is `https://botokaw.ru/strik?utm_term=what+kind+of+compound+is+potassium+nitrate`. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=what+kind+of+compound+is+potassium+nitrate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407070/normal_605d21b961b9b.pdfIn PDF document text
    • http://kekebol.iblogger.org/therapy_worksheets_for_grief.pdfIn PDF document text
    • http://twenty-promo2020.ru/2014_nissan_sentra_service_manualx7lj4.pdfIn PDF document text
    • http://podarokinsta365.site/xareduxibajatiqo5og.pdfIn PDF document text
    • http://trendmobile.ru/34889026956sghr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fcef8e12bb54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6041f5dc498fc.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/73323033195ul771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_6027e7e1a2496.pdfIn PDF document text
    • http://pifaxobi.iblogger.org/vujuzozowetuvafetazed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofefebevuxojaf.epizy.com/90391280677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8496c806-47da-4963-b9cc-f6bd599dadcd/33632217402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b45a9ba-beec-468b-a153-8411e48c2cff/55156588068.pdfIn PDF document text
    • http://mupefapakag.rf.gd/current_affairs_cloud_may_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1318bf-d077-4988-9e92-e57bc940dab0/hp_officejet_pro_8600_plus_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fef860-fd31-4f0f-b299-8126408a489d/xajepizuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e78d0a6-6376-4fb2-be4f-6b420d26fbff/nc_drivers_permit_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13fa3e2-d2ba-4baa-8093-ad636129e2eb/69020778181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e29d63-3623-4a1f-911c-07c9b81ebd84/how_do_i_reset_my_jlab_earbuds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7564dfbb-df6f-446f-bc10-fbd4a163950a/what_is_or_gate_in_digital_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc1d6ca-8488-4936-8b85-ab4781dc1e9f/google_sketchup_free_download_for_windows_7_64_bit_with_crack.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_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 5440 bytes
SHA-256: c99d3e7a8576d85f1753ef63d4fabce3e6d4633fc827c802e39bf3b0c69ae83b
font_01_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 10788 bytes
SHA-256: 0cd5cc5eb611e6d390d7b19764ead1bca380e2e8c02830936b2e51d8b27ace8a

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