Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f72379e5ea81ea8…

MALICIOUS

PDF

85.4 KB Created: 2021-04-05 18:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2dae98f905e2ff58643c318ff3ef4c6 SHA-1: 963e80a7d4fccb075a9955baad351f5ee5637584 SHA-256: 4f72379e5ea81ea8664969879f8b79c65c20f50b7810caa8bbee2703efca1555
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://ponafet.ru/strik?utm_term=m+audio+fast+track+ultra+mac+mojave PDF link annotation
    • http://rejemezurufoveg.mywebcommunity.org/the_unbearable_lightness_of_being_subtitulos_espaol.pdfIn PDF document text
    • http://gimudal.iblogger.org/18670072789.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/kimezibetatifilurodogapuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limuzer.atwebpages.com/vutewuvuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c023fa5a-6b90-4a6b-9872-dffe20dbe16b/craftsman_17_rear_tine_tiller_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928a8848-0406-42ab-8d61-2b0daa6e60e9/21091269156.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/25998238515.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/que_hace_el_sistema_circulatorio_y_linfatico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122cc38d-8111-4adf-aa76-c14dd5e7271c/ever_be_natalie_grant_chords.pdfIn PDF document text
    • http://furiroj.rf.gd/esmo_handbook_of_clinical_pharmacology_of_anticancer_agents.pdfIn PDF document text
    • http://fisubilir.epizy.com/87702391891.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/arrow_formal_shirts_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f3d1f5-4de8-48b6-be27-fcc8ca6ef7af/homelite_gas_leaf_blower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0eae87-e085-4051-8aa9-80700c53ddc1/takesutavisowejixasixo.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/ziroxegagojadipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748be927-a033-4fab-ad4e-f41bd30f4612/88730650666.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/tolerobirujufita.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/63402733360.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_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 5372 bytes
SHA-256: 772e15a386564224a91e7beda16fdda454313fde669ce80c21f07466fafa3e21
font_01_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 12048 bytes
SHA-256: fc1147c83a3600e966ec61178bb2d59d20825798134e2e9c926190f8c610d9bc

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