Malicious PDF — malware analysis report

Static analysis result for SHA-256 1758bce5d94ce3ca…

MALICIOUS

PDF

73.3 KB Created: 2021-04-14 09:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7639c06f43eda9d8e4369406b817745b SHA-1: 0983f2e2f45a597ff0768e57feace5c08df61178 SHA-256: 1758bce5d94ce3cadf886f0705c131d539b7ec2be8647e7870d5f3de299d988f
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 0.9997

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://resalured.ru/strik?utm_term=bar+graph+worksheet+%25231+answer+key PDF link annotation
    • http://xejapuz.getenjoyment.net/asuhan_kebidanan_pada_ibu_bersalin_dengan_atonia_uteri.pdfIn PDF document text
    • http://clientesdkb.com/worksheet_on_vernier_caliper_and_micrometer_with_answersihhwa.pdfIn PDF document text
    • https://sotewedizi.weebly.com/uploads/1/3/4/6/134698886/2013942.pdfIn PDF document text
    • http://kusukeluwabe.mywebcommunity.org/tecnicas_de_anclaje_pnl.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/dhdHNhf/55320953685.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/iijjgRJ/80916242700.pdfIn PDF document text
    • http://copyrightreports.com/gowivuxolewabupewirob8gshj.pdfIn PDF document text
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/nepemu.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/69067992052.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/wilton_cake_tip_chart.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/what_is_pilot_arc_on_a_plasma_cutter.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/6714ac64-2bf5-4300-81e8-94f0e9dd14c7/how_great_thou_art_printable_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863417a3-0bad-4207-bfbe-35eda855b650/jifipefomotusazasamuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb641d9-f294-4a6d-83a7-a9538da6eb68/36678082754.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/nageteresiloxawoputu.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/checkbook_guide_to_federal_health_plans_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/zasazetejutow.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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 5256 bytes
SHA-256: 99143f46be486b9eeb76e1cf468a60a12c9ead4a1d8d573c15b51a72332775d5
font_01_sfnt_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10332 bytes
SHA-256: 2a1964a5fc888af2a17c6a87f51f0bc6530d6fc0d2e4b0740d49cc22a6d5df3c

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