Malicious PDF — malware analysis report

Static analysis result for SHA-256 887ccde3232ab1a9…

MALICIOUS

PDF

83.8 KB Created: 2021-03-18 10:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 42ed0a98f14d33462e37517cc8841e7a SHA-1: 1091c8f189b1e35e5059daa2c3390f4504f56fdf SHA-256: 887ccde3232ab1a92b29454364c2abc0a1e7f66d8b019074f24915b7ae0573f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=demogorgon+dead+by+daylight+guide PDF link annotation
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/rabizifadabawib-lekizarezibi-rebuzetif-rutusijugeza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fe51cd8bb0bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5fccb3a7c1510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6038b55c3bdcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5fea27216db75.pdfIn PDF document text
    • https://pikitepilizoj.weebly.com/uploads/1/3/5/3/135332880/bd9434b2822ae.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/dbd0f14c93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_60248fa38a68c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5fe00ba59230a.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/pazobe_wafutegibetew_kotudiwifup_dajova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5fe02a7e63532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_601ec3726a246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/nervous_system_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/weather_report_johannesburg_next_7_days.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c356d6f-7c10-46f0-95a4-779f66ded90f/fopepadukigukorilevutaxud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722e306f-955b-40ea-a0f2-9d815a6af98c/duxirali.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/67883009040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da22563a-e800-4008-88c9-2ba1409a9a0e/famous_quote_about_judicial_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23716287-85d9-45cf-a113-c121f8d51521/28508802642.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/3583306130.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/magicjack_free_call_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce351b89-590b-4654-a7ff-a50ebb799209/78012661854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80621b43-c09b-4e4c-8e3b-2c3d4faf9533/how_to_read_music_alto_saxophone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb22ad7-b3d8-4b12-87a8-4a0dd4a9b069/565049865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d0ddb3-7df3-48cf-b9b4-33c94e8222c0/xixozimixokotavukanan.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_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 5300 bytes
SHA-256: 7f12f4b0c2e3a60cc887070ce2c1e2b14637ce21ff4bd829e5c6c88c86df4af3
font_01_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 10552 bytes
SHA-256: 19968c532a10172b78e5a856f36d41c7074a89c366e68eaeb581bb7250e31839

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