Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b65cbf6471dae3…

MALICIOUS

PDF

73.7 KB Created: 2021-02-26 15:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cf312b0e5e5d5fac8e5dfd94292b9bdf SHA-1: 7e3e09c7745f9c0769075f123513e7cf3965fb3f SHA-256: 19b65cbf6471dae30bedc27b19d6fd3b76afaa53fc082677bc87bb2791f2df1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for exploitation or credential harvesting.

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://pelibifir.ru/strik?utm_term=m+audio+firewire+410+driver+download+windows+xp PDF link annotation
    • http://bebetadiruj.mywebcommunity.org/how_to_understand_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/LhewChj/jewish_history_matters_podcast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fd95a510d827.pdfIn PDF document text
    • http://detonic-italia.website/70730024049r9qz7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fe875cab2363.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/zovomabuxavusopoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/caKicgi/vagegewitun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_6018ed220535a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_60149f2f6feae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_600ea38942a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_602782d3a65d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_5fd5f1ecac2d4.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/ximonovogevurigomulub.pdfIn PDF document text
    • http://vidclips.design/a_writers_reference_9th_edition_ebookmxbr2.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/ggPwjhD/lulaniwani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5fe7bce71279b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc8d4bccfa85.pdfIn PDF document text
    • http://abzac.me/wazozojaggrx4k.pdfIn PDF document text
    • http://reduslim-eu.site/the_road_cormac_mccarthy_full_movieupwzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/antikythera_greece_application_form.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 5540 bytes
SHA-256: 2a9f31e82fac5945fb69e08a6ab9b6af9d9773478a273866d98852d53f3610da
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10796 bytes
SHA-256: aa8056c9143e3de4b6347e3507e9506b5bec03ba70f00f02f5ce190a7eafd628

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