Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fefb467e56e174…

MALICIOUS

PDF

81.9 KB Created: 2021-05-27 23:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc03cc4583cbe5dc4c4ab01065f83674 SHA-1: d4f252386fe204131051e26569ab34a33a9da5fe SHA-256: 98fefb467e56e17458fc54457b11e49c82a1f65aa18a7f75f6a3a00977b9a58a
194 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 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 0.9990

Heuristics 7

  • 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.
  • 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://crophysi.ru/123?utm_term=candy+crush+soda+mega+mod+apk+revdl PDF link annotation
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/butokal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd89a23965c1.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/8965811.pdfIn PDF document text
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/sipodof_nodipekirez_mupazepofipig_figutimigapov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5fc7613b2ad11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_60145dd738002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_6011ec9139a82.pdfIn PDF document text
    • https://ledugatikafaf.weebly.com/uploads/1/3/4/6/134693541/afc7e4.pdfIn PDF document text
    • https://julupovopanar.weebly.com/uploads/1/3/4/7/134732987/zokejenotugawed_fufevujedavev_vevazogofu_vamopikajedev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_6015f4b16ed32.pdfIn PDF document text
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/wobelavexu.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/c0e9625ecc.pdfIn PDF document text
    • https://tetafawewaze.weebly.com/uploads/1/3/4/3/134378669/bazagevexeposut.pdfIn PDF document text
    • https://felomadexibeb.weebly.com/uploads/1/3/4/6/134687620/12df2a44.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/kimufa.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/tikijedojuvol.pdfIn PDF document text
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/vilexokipapoxi.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/0ce21a63-64ee-45fb-8b2a-1a27abe7c9df/videos_de_msica_angolana_kuduro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd43465-ed02-4252-b1ae-230e27d29cb9/67887557298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac482ce-0d3b-4118-a9dd-23d84899db9d/how_to_get_a_job_as_a_technical_writer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f60ee7f-ff4c-4643-a755-2802ba7b69c3/how_to_connect_microsoft_sculpt_ergonomic_keyboard_surface_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab9c66f-bfd5-444d-8c1e-bc1dfdcf00ad/libro_de_anatomia_humana_quiroz_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826b62a3-11f3-473a-bd0c-8ff234cf9dec/convertir_mm_columna_de_agua_a_pulgadas_columna_de_agua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86f8b57-b767-40f0-92b5-53fbe253b407/40152312571.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 2900 bytes
SHA-256: 5cf337998088bb8a04928a987b770af1eecb8547bb54860cef731604825703d9
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 5620 bytes
SHA-256: 3c32fd0991275b90bd5c48e0be41ca557f095ef9ad7daf0a16c09ae43afe9fc3
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 10664 bytes
SHA-256: f2fb2b5ec446e292997c569960e7abb77faa35ded19c23a6f6c0864abcc78f47