Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c91b76a17fa88ea…

MALICIOUS

PDF

99.1 KB Created: 2021-05-22 09:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d9bbbd5e4f7891918422c7a64cb5a06e SHA-1: 1e26474e4a267ca55340236433f126a5115a1571 SHA-256: 2c91b76a17fa88ead9eb6ea41637d03620c198cdf8bda06bb6b7eddaf08d4406
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=curb+your+enthusiasm+season+3+ep+5 PDF link annotation
    • https://makodute.weebly.com/uploads/1/3/4/6/134649936/8459736.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/moragaz.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/3018028.pdfIn PDF document text
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/2aef76e142.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/fenoxawazefuf.pdfIn PDF document text
    • https://pigudoxuwupif.weebly.com/uploads/1/3/1/4/131437670/ripeledorixidir.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/72457ffa7.pdfIn PDF document text
    • https://linoraza.weebly.com/uploads/1/3/1/4/131437671/98d8d64eb.pdfIn PDF document text
    • https://garugufalavul.weebly.com/uploads/1/3/4/5/134507034/vogusewax_fijagoxi_xivowu.pdfIn PDF document text
    • https://gapibuxox.weebly.com/uploads/1/3/2/6/132695643/9c3161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_600c003631888.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/febasuz.pdfIn PDF document text
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/rageboxoxizuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd1086b9ef8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501804/normal_5fe93b9c60176.pdfIn PDF document text
    • https://nikamajavefuxo.weebly.com/uploads/1/3/1/0/131069808/bbef11de.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/61092893-34b8-43cb-abac-54b42d9ff52b/iworld_bluetooth_speaker_system_for_garage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e9e3c4-ae2e-46ed-9b6e-b2c43c069de6/epson_artisan_835_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffd5647-fb84-4539-badb-1f4221ec1e98/81050202746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611709f3-493e-430e-99e0-7bc9d6f4b585/21686068797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2716bd39-ea5a-4be5-8251-0a6b5a714a5c/21893819050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6795f620-a56f-4f88-9018-b608b8415b79/what_are_the_5_steps_involved_in_carrying_out_a_risk_assessment.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_off000144a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A9 5460 bytes
SHA-256: fdd853ba320acc7bf3d0ebcf5cab593d643527db7f43db8b7284ab134a405eda
font_01_sfnt_off00015714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15714 12324 bytes
SHA-256: 962ea6d356455fbbb3f00c531220283e0e19ce8709fa9b80d95d5acce1f76def