Malicious PDF — malware analysis report

Static analysis result for SHA-256 4292579cef50ddbd…

MALICIOUS

PDF

115.2 KB Created: 2021-04-25 00:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7f8faf359d89bc940e7d29c77ca3c143 SHA-1: 24c77a1b70e3a305e269d6fb31b64826527f1302 SHA-256: 4292579cef50ddbd3fe51a2d9bf5cfa714c1de2fca8b4524f7b4795d5b85dd2e
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains or redirectors, indicating a link farm designed to lead users to potentially malicious content or phishing sites. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in PDFs to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/strik?utm_term=does+roku+need+batteries PDF link annotation
    • https://cdn.sqhk.co/xugiwatokax/jfggNwy/22924701439.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/uO3glie/lekelanawilulefixel.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/hazEuny/45163081514.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/QM4kJhg/sewajofavesameda.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/Uc6hjgi/mibiverexa.pdfIn PDF document text
    • https://jefaxuler.weebly.com/uploads/1/3/0/7/130775921/3c43a07.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/9018391.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/fa1fea14-e9ac-4cf8-926b-bf38d38b1556/maytag_quiet_series_100_not_working.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_e464a0ac70b4444d9edc6f4baa9f09dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6868d3a4-90a1-451a-8196-ecc2313dc86c/venoxoviwif.pdfIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_1f5122575ce446f78ad45294ff8c8457.pdf?index=trueIn PDF document text
    • http://dereworizezo.epizy.com/oxford_discover_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf290c01-5c9f-48b1-839a-cc040562ca74/star_wars_encyclopedia_online.pdfIn PDF document text
    • http://matogojetize.rf.gd/city_of_stars_piano_sheet_music.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_f86e5f6a931f4023bb3e232ca8dec8dd.pdf?index=trueIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_1a1e33508a4e425ba78570856944678b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7871263a-2fda-4946-9506-561885b8a4d5/simplicity_regent_38_parts_diagram.pdfIn PDF document text
    • http://xuxereda.rf.gd/ginaxinikezaza.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_f84a19036bd6406f9d3d0d6bb96d9974.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41039608-37fb-4d6f-86dd-e0a8d4a8f84a/rijanadokipesufozegar.pdfIn PDF document text
    • http://popaxaxi.epizy.com/cassava_starch_production_in_nigeria.pdfIn PDF document text
    • http://jelasojeb.rf.gd/badoo_premium_lifetime_apk.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_0c08a5426d2a427fbafa2fcc1bcaad5c.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_off00018556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18556 4992 bytes
SHA-256: 36b1635721d09239a66abe8fbb4f81c0bba899569692202687d56aaa90509df7
font_01_sfnt_off0001965a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1965A 11796 bytes
SHA-256: 400e9af846269243b314de2981fc7b066386f9b785692b3fe7c842b6da774906