Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3114e271d0738f0…

MALICIOUS

PDF

77.1 KB Created: 2021-04-07 02:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a820404ce233b56605a89e5c1ca219d4 SHA-1: b3d1b63a6edf83954ae36c18b617c5c0be4ed59e SHA-256: a3114e271d0738f062b9163685765b4ce614e844b9a15c544415bca3782efafb
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 0.9996

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://ponafet.ru/strik?utm_term=how+to+write+walking+bass+lines PDF link annotation
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/jozedipefe.pdfIn PDF document text
    • http://inostrana.com/punisodigeruret7y1ml.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/tafesutikesalomutagorodab.pdfIn PDF document text
    • http://lanurekomi.22web.org/misaninek.pdfIn PDF document text
    • https://webenimuto.weebly.com/uploads/1/3/4/8/134846763/87233f8.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/117ba955.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/1286355.pdfIn PDF document text
    • http://getveran.site/43631067072zdbmb.pdfIn PDF document text
    • http://yesnutural.space/factorising_quadratics_worksheet_a_level8pwj4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopijejezi.rf.gd/california_deposition_objections_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720966b1-4949-4d45-99bc-b48eaf77d7cb/9435526498.pdfIn PDF document text
    • http://nibexavu.epizy.com/nowolezudoxesitakoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4ba0d4-fda5-48e0-b937-a2e19cae2979/is_the_nuwave_brio_a_good_air_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cb9d95-0a9b-4269-be76-288b88dc229e/product_management_books_2020.pdfIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_dc342059c7ad41449dae71a18ad4d093.pdf?index=trueIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/33607385363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911af806-e3d0-479d-b277-f50f7e1fe303/kanofeviridulile.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_d9f7ba336e1641e4a075946099810bc3.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_6502cbc5fb934b0db530b842c82cf428.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7465ccf8-1d5f-45ab-8aea-2f2a650fe50d/ridimapojegonitot.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_d325b7297bc941648390f57c292800de.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_12f6beb68051496ab1d808508cb7a800.pdf?index=trueIn 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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 5112 bytes
SHA-256: 21339b03b4704086a0ef5ecbec670ee09e080882231fa5c48521659fbdcef5d0
font_01_sfnt_off00010277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10204 bytes
SHA-256: 6ecf380ba59f8ca282fe973497909da543294db633465f5c1577af2e629c5c09