Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4520a57d5be0c54…

MALICIOUS

PDF

93.4 KB Created: 2021-03-08 18:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 536683e15becacf1e82c8fa150f9f9c0 SHA-1: 92238a36a03810e3283ffd4fe2929ea016e45516 SHA-256: c4520a57d5be0c54454274bcd7ca4369644df62c2a08665ee367f8d0df48cbc7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=how+do+abc+fire+extinguishers+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fd79163eb43e.pdfIn PDF document text
    • http://summ-green.fun/56963735263zjpdb.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/nGggidX/zoom_cloud_meetings_apk_for_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/jorubili/ibG7jey/super_soccer_noggins_2_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/h1QAHif/xusotapi.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/aicG809/dupoxipuketibowu.pdfIn PDF document text
    • https://cdn.sqhk.co/difusivoga/JgghfVM/ejen_ali_emergency_1._4._2_mod_apk.pdfIn PDF document text
    • http://fruitslope.online/census_report_2011_west_bengalu2l1d.pdfIn PDF document text
    • http://megalit-korolev.ru/stocksubmittertblnu.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/d45wRje/76053729677.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/iepjiii/bingo_games_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/jmijjem/pomasowererukorexof.pdfIn PDF document text
    • http://fakts.design/zolunikoloxafuxofiwetilw4445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478408/normal_6015563925baa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_60380795c5bbf.pdfIn PDF document text
    • http://italiabeach.space/gunarosavuwidakoke1txfs.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/d0cdae46-92b6-4f06-b867-01be9e90cdea/tekul.pdfIn PDF document text
    • http://latilofu.rf.gd/26489703018.pdfIn PDF document text
    • http://nupudanotagudot.rf.gd/learn_korean_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c788985f-a407-4015-b578-e765cf31a09d/16901704041.pdfIn PDF document text
    • http://safadixuzet.rf.gd/lidajogemodamiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231760fd-829a-4807-bac5-3941a07498d2/dell_active_pen_pn350m_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5641aaf5-0c40-47e4-9dc9-00927d16ff13/yard_machine_31cc_tiller_carburetor_adjustment.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_off00012d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3A 5576 bytes
SHA-256: 664631250eaaf5fdf42bcf12d233f56fec2c1292cf1ef69a89013f86e6165c60
font_01_sfnt_off0001403d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403D 12500 bytes
SHA-256: b34e760a3c0c28fcd89c867349113a73cb7f073b160cc9403deafe34b72ca28d

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