Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef361586a7bb6c2f…

MALICIOUS

PDF

110.4 KB Created: 2021-03-28 11:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 858b789d3068bef5ab2dab46fbf588eb SHA-1: 2d1f01d6bf626a19ec2427ffdf667fde1215a67a SHA-256: ef361586a7bb6c2f3404b35b699183c9b4a8c41ea39f4a7c77b63e2d1b42a0d8
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=food+matters+holly+bauer+2nd+edition+pdf PDF link annotation
    • http://starkrobotics.org/championship_manager_03_04_data_editorrgdba.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/SBgej68/sogugexewovexudokaj.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/gjiaBeZ/frases_tumblr_cortas_de_libros.pdfIn PDF document text
    • http://winoorama.website/534250932535gsfa.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/iehfOiv/zozeweluwaxafowu.pdfIn PDF document text
    • http://sayseedokg.com/mupasuvekanigusajili7doft.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/oYgdid5/vizuzavabiziserexunuj.pdfIn PDF document text
    • http://arbitestpark.xyz/386172754241yckf.pdfIn PDF document text
    • http://baugroup.info/dizziness_remedies_at_homeii93s.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/3147799472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wisunabowogus.epizy.com/reports_released_by_world_economic_forum_upsc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72fd9e8-8824-49d4-a6c6-daca6c5274d7/white_christmas_tree_ornaments_balls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ceb368-c30d-4d6a-a30b-c393056ed2bc/43417849344.pdfIn PDF document text
    • http://gugujis.epizy.com/49370495185.pdfIn PDF document text
    • http://juropap.rf.gd/5464386697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42590235-dc16-4300-8c36-19cba6db5a9b/69772707606.pdfIn PDF document text
    • http://zomekijisev.rf.gd/communism_socialism_capitalism_worksheet.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/jaxigovifik.pdfIn PDF document text
    • http://lutesugobomo.epizy.com/barracuda_spam_report.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_off0001757c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757C 5612 bytes
SHA-256: 96568686b6ac09f87d6ff6d26720eec71e9b571e9a985e7cea0aead88b180560
font_01_sfnt_off0001886b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1886B 10376 bytes
SHA-256: 7ac9ff8b82105f2cfc0f555297e3fed0d848d6ef9f9999f12d529d76c1fdadc2

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