Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f8ae37e560ee4e…

MALICIOUS

PDF

72.5 KB Created: 2021-06-01 02:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b14808e4a805ffb3298af8d07e73449 SHA-1: 9ef60efbaf766b7dea0607e7b8eb3cf719419bb3 SHA-256: c9f8ae37e560ee4e4484bd486a08e18237aaa7c0b335feb56ca2e8cdcdd090e1
186 Risk Score

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 0.9991

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://coretry.ru/pbw?utm_term=shiv+tandav+stotram+by+rameshbhai+oza+free+download PDF link annotation
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/5eacab037.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/4823684.pdfIn PDF document text
    • https://napuguzexavuzes.weebly.com/uploads/1/3/4/8/134875267/46ccb7e43.pdfIn PDF document text
    • https://robiwadanojiso.weebly.com/uploads/1/3/4/6/134644007/4669445.pdfIn PDF document text
    • https://rilofiwidipu.weebly.com/uploads/1/3/4/4/134455443/larozedegegejoxat.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/ribenikexo-gomonezopupopor-wigosago-waxuf.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/a6c8b8fe82b85f4.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/d87649b21.pdfIn PDF document text
    • https://kufuzuve.weebly.com/uploads/1/3/4/5/134589172/kokudu_kuzusevuvilife_viripu_kitebe.pdfIn PDF document text
    • https://vuzirokisex.weebly.com/uploads/1/3/4/5/134576988/5950591.pdfIn PDF document text
    • https://ruwagifixub.weebly.com/uploads/1/3/4/0/134013037/7738673.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/7732352.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/5b7e93ff-974e-4f6b-aba0-c520a0477fe4/bivumavuvibodekemidebig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92e9a29-9451-4364-b848-a9785088e724/hamilton_beach_flexbrew_coffee_maker_not_working.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424116/plantilla_libro_diario_para_imprimir.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/29392806179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fdd4fa-2169-4b06-87de-5b9756841374/sapiluropidomofamebe.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/sozewanimelovagexizuzenem.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/xegaleki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8085bd90-381f-4efd-a4c4-f281e436a463/zajizum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e3a537-aa62-4fed-82b6-ba2420df89f8/power_book_2_ghost_season_1_episode_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5119c3d-3954-4ac6-885e-bb78e22abb25/muxatixes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902c77f1-631b-4fb4-9500-04c1227edd14/curso_primeros_auxilios_online_chile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955f935b-417f-42a5-90c9-78f044ef57bb/tissot_t-touch_expert_solar_anleitung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e4f212-7d87-4104-9733-2b5b5a240611/sunitixovibedo.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 5692 bytes
SHA-256: 8f0b75618a391224d85608ec344b7264889b2e13c6a3ad3ac43684ded59d2cce
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 10912 bytes
SHA-256: e800ae7613d89dd3781c25c239807217aa105daabdc57e8ae84f4806ac508c9b