Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff72cd91ec69402…

MALICIOUS

PDF

73.4 KB Created: 2021-02-13 11:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: b7019f9614f2e36994bd7859cad03bd0 SHA-1: 558c1b9372bc0669e80c7d7a9ab23ecf2c0d7bf3 SHA-256: 5ff72cd91ec69402364d8cc5a2bf54ecfb801568b63e40c0f9c4576facf7874d
196 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
  • 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.
  • 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://bologen.ru/wb?keyword=cdc%20vaccine%20schedule%20child%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5feb9a6e7373f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_600f4f00912e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_601cbf9d29db1.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/djjhZfQ/56793939018.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/YVD4CDa/allegiant_flights_bismarck_to_las_vegas.pdfIn PDF document text
    • https://zapikomamotal.weebly.com/uploads/1/3/1/6/131606370/mejiziruw.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/ijhDNMm/73380974096.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/devatazogo-jarak-wunomavikum-guzenosud.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/550888.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/semuxemakaw/43820970970.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/sheetz_store_manager_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/zozevesosaxe.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/autodwg_to_dwg_converter_serial_number.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/56246878399.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/adobe_acrobat_reader_8_professional_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/cbse_online_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/70229459652.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/47863077681.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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 5112 bytes
SHA-256: 666976373141534f3b577700e9f3f257cad92556474f4ce3f8c0028bb8a43fbc
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10192 bytes
SHA-256: 95ff451c88cf0286d79f9368f1117a3a8d132ca264d1ec8394607814c29f795b