Malicious PDF — malware analysis report

Static analysis result for SHA-256 479a14bb7e66a94f…

MALICIOUS

PDF

68.5 KB Created: 2021-01-01 17:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: b3d735514489dd872c7373dfe9a7da6d SHA-1: 5a6cc6f33471b537d719c8f7d7b3931e8e7e4ee9 SHA-256: 479a14bb7e66a94f519834e8bddaa3140325d854c9fb8c23e2fe1a2583f204ba
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/wb?keyword=rta%20audio%20analyzer%20apk In PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/dalaxadamedokam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd78516128bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_5faa2536937e2.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/virif-kuwelu.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/bisazabe/64771603114.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/mexawug.pdfIn PDF document text
    • https://s3.amazonaws.com/nagavuwofapan/fibejijegurexoxapumebulu.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/60055377230.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/mozufudibulefibupiveg.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/consider_the_lilies_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/71764061155.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/manyana_surf_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b3dcbe-502b-4ec7-944f-435f2c3c56b6/75154958633.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/munitaworobifobikido.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/morrowind_telvanni_hortator.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_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 5000 bytes
SHA-256: 2bb764ea8d8dd34525a96b2e704687945dc47153f9aebf832e63528c65e4fc71
font_01_sfnt_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 12400 bytes
SHA-256: 5c5dbf09bbc341e0178fefbfef409c0c8e8a6b1117d62d17731c7a41febbadef

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