Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee98a9adb4db8eef…

MALICIOUS

PDF

76.9 KB Created: 2021-06-13 01:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05d1194b4991b1021d6775441742eb81 SHA-1: a77519bc472e783ad7b7d7684794b95227f76af2 SHA-256: ee98a9adb4db8eef7c959315507732910723ba4cba04495778721ce8b4d00440
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/pbw?utm_term=yasin+sura+bangla+onubad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379359/normal_6048442565876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_606c63f460366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_60c1e2b42f780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5ff069db42cb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5ff3e4d45bbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60570a0c45981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_6022aa1b2d852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380229/normal_5fcc9a42b9c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_604ba53b5211b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5ff1dfbe53530.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilanom.pbworks.com/f/pinemurogatogo.pdfIn PDF document text
    • http://nukisefel.pbworks.com/w/file/fetch/145045881/luxux.pdfIn PDF document text
    • http://tedadopite.pbworks.com/w/file/fetch/144913674/66498474293.pdfIn PDF document text
    • http://katexawa.pbworks.com/w/file/fetch/144700350/human_anatomy_and_physiology_marieb_10th_edition.pdfIn PDF document text
    • http://zegakodas.pbworks.com/f/43179700145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b4b241-c052-42ae-a1f4-ea90735c8d69/libajonivu.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/4579285797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b6cd2f-fb23-4f9d-9fc9-1175613867ee/72614768740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed81c7f2-60b9-4af4-bc40-5433b1e0895d/jumizoned.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/isaac_physics_answers_efficiency.pdfIn PDF document text
    • http://rerikisozid.pbworks.com/w/file/fetch/144639591/620309692.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 5092 bytes
SHA-256: c2a0122fb3dd483c3f834c4f61d2af5649a605303dfc1dc911538048d28b03d5
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 6592 bytes
SHA-256: 58bd0ce11a606cbdeb951f2cef08955c080c63f30024a3a366f41fd5288ab663
font_02_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10448 bytes
SHA-256: e155324e8c9a72149b51671ef02e6879053a6bb1cb1da3e8507ba799163c5216