Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb402c408f53772…

MALICIOUS

PDF

63.2 KB Created: 2021-02-10 12:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1434e99a39aecfcd83895cec2aa69241 SHA-1: c7057245603e68638790361a460728fdf568b603 SHA-256: cdb402c408f537728af22f63680c19964d7c648e810940402c0313603dc3dfd7
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://crophysi.ru/123?utm_term=harris+diatomaceous+earth+food+grade+for+humans In PDF document text
    • https://cdn.sqhk.co/zowolanazew/jigfWgh/descargar_zombie_tsunami_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527237/normal_5ff2567c73ed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5fcbbfdb0d1eb.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/bhfBghT/calendar_august_2020_template.pdfIn PDF document text
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/mijodiwejepu.pdfIn PDF document text
    • https://cdn.sqhk.co/lalamiteliw/2qhfjgV/hotel_luch_panichishte.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/f06jjja/zimitatozudogubujawakedud.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/mgdQsLo/36638186240.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/i4uqJie/gerebosevobukem.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/sepawi/xa_trang_file_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/70731571134.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/69595042793.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/qual_a_forma_de_transmisso_da_ascaridase.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/sound_absorbing_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/xajewege.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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 5364 bytes
SHA-256: d16e08d293f54a9de996ab9bb0b2817bfcd0ed06eea1bfd47485113ba3cd8c74
font_01_sfnt_off0000ca54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA54 11276 bytes
SHA-256: 59b2ac21b62f1993a6be36ca16b7e4882ddc3c4df149d8e2b1cbf829a80e3a3b

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