Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1e4fa67bac986b…

MALICIOUS

PDF

87.6 KB Created: 2021-03-23 06:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 786890d52aa6723151270a181b11a516 SHA-1: 8263db33447b9f0968362654c95d7e3aa757f916 SHA-256: 3e1e4fa67bac986be6d528862fc382655963fa6072b8615a57488778bb50f1bc
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirectors and disposable hosting. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to lead users to harmful sites. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=diono+radian+3rxt+width In PDF document text
    • https://cdn.sqhk.co/feguzuvubut/gdjijhr/79457527666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fe965f8d1b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366007/normal_6002a41d6e494.pdfIn PDF document text
    • http://sikovagaxuwe.22web.org/pusivoboruwoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_6013c3837c17e.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/jW33cgc/bukida.pdfIn PDF document text
    • https://cdn.sqhk.co/kanereneb/UqyEYtF/microsoft_bing_translator_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/SHjcijT/danafigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6015ddeea5c8c.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/1ac305e7-e92f-4635-b71d-ff86a5ef815c/how_to_clean_keurig_2.0_k400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26f66e9-8684-45dd-af02-768f53dbd479/marvel_movies_avengers_infinity_war.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_41fc8fd16ec94eabae252286e77de9e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1882502-40d5-4383-9dbd-135fa3cd95f0/lobotamorozoje.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/21247423537.pdfIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_47bb84af0c6c4006a5c856c1bfac2495.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_22ed245695194dffbd3af3a8905e1c42.pdf?index=trueIn PDF document text
    • http://zometebuwafuwix.rf.gd/25926630076.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_f05af668de9b4ab494ff135b7752620b.pdf?index=trueIn PDF document text
    • http://nebugobebakejef.rf.gd/fugimuxebewuveza.pdfIn PDF document text
    • http://tefegofesewo.rf.gd/7298557549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf4cb56-51b2-40cd-a0a9-1bdc8470bd01/julius_caesar_shakespeare.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_d42ce1acfa6744e996bc45eac454ae1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44203a4c-7952-462b-9847-a62c402a790b/87704587156.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 5024 bytes
SHA-256: 0bd5db83fbdfd0e3e1aa0472f37b990130c149a0329fd68f3f4f995da1c34e55
font_01_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 10924 bytes
SHA-256: bf0601f73e8f4b11fadffc25ff7e389aaaf88530c52250b16eb6fdd92a19307f
font_02_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 16076 bytes
SHA-256: 5d52f40a13f54bcc329d29992e3abd0fd28294c8bc547691d9075fb1d42365f7

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