Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0368857db7fd00b…

MALICIOUS

PDF

64.4 KB Created: 2021-02-17 14:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d3e4d4bb738bb5a4b53ead856811c5e7 SHA-1: a574f42f7ed1a8a69c2bbc5f32665187425eabd6 SHA-256: d0368857db7fd00b2566cf8986cffce829a91b275ee61e057fa951e0de5d086a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URLs, many pointing to disposable hosting services, suggesting an attempt to distribute malicious content or conduct phishing. The primary attack pattern involves leveraging these links to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=what+are+good+rapper+names PDF link annotation
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/47454cf58eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5fd5fdc124f65.pdfIn PDF document text
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/furef-wolukefotexit-peroki.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/9360772.pdfIn PDF document text
    • https://wikumegi.weebly.com/uploads/1/3/1/4/131407968/4c2b2.pdfIn PDF document text
    • https://nokidevekixim.weebly.com/uploads/1/3/2/3/132302759/marusedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5ff3b2e53a39b.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/1293504.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/risigameroxev_davirifodagiv.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/4800609.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/xewiwo.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/xaloxuximetagenof.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/6411898.pdfIn PDF document text
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/2498496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5fd253285d26b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fc7d12984f82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5feb05b02c0bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jenagubadopi/left_side_menu_website_templates_free.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_off0000b4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F6 5092 bytes
SHA-256: b2affaaeefb4122db5315e676dd1d0a153529c50b94b6e1fb023a4e70e0f27b7
font_01_sfnt_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 9440 bytes
SHA-256: 80a6e9b40b44f9692b7be533c4c9284ef2c805d1f7f7766759edd79cd8843cd7
font_02_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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