Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4778dd6c4401c74…

MALICIOUS

PDF

77.1 KB Created: 2021-05-15 01:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e5514f44295b00aa71951d936c684793 SHA-1: 262df16d6af134644de2a135b25e5229284b924c SHA-256: c4778dd6c4401c74f3aee82620086ce0d008053b315beef902a458cfd08c1694
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=how+to+use+a+diehard+12+volt+battery+charger PDF link annotation
    • https://cdn.sqhk.co/butituguxur/ahgXVNc/candy_movie_2017_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5fce46d7616c5.pdfIn PDF document text
    • http://busibear.com/equalizer_pie_pro_1._1._0_apk_download8ncla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_60215fda1e1c6.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/883241c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422912/normal_5fd05f096f35f.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/4784620.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/biafdRG/that_s_up_to_you_meaning_in_malayalam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_60435669b8b5f.pdfIn PDF document text
    • http://betmoy54.com/91483136556oql8p.pdfIn PDF document text
    • http://flowerport.store/vowejolopofchtbo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489850/normal_5fdfd96b5f1f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_71d451f66fb0490ca6434e0f0cc1e540.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_64f188b95f114ecb8fba2f810d51cbfa.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e529cbf8ef614b1886a5e69d709daaf9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/26649849462.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_07f7725ec959459b8fc61a6dbf9a9053.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defipedibe/nuance_viewer_plus.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b729b1835d6842f8b83fca9f499bc408.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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 5740 bytes
SHA-256: c273fa32f0c6e96fc68a5ca28a0960227e83988302de0c6b38b9425a262d14b9
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 11492 bytes
SHA-256: b046d0652642c42f591197c1257c65b14b745049d66fbda4df87d638c11790ea

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