Malicious PDF — malware analysis report

Static analysis result for SHA-256 6265cbafe481ab78…

MALICIOUS

PDF

41.8 KB Created: 2020-10-12 06:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 79bd89694305b2690d1d3fcc1a7bd385 SHA-1: b338e4f2fc1a59b041681a00a724f140d7cf0e66 SHA-256: 6265cbafe481ab78e1ecd7b24dc724de61c3372cc729071387878ce926d8d5cb
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=st+charles+county+collector+of+revenue+phone+number In PDF document text
    • http://files.protectionofmarriage.com/uploads/1/3/0/7/130739850/mewejuxelesigivanami.pdfIn PDF document text
    • http://files.trainkc.com/uploads/1/3/1/6/131636792/18ed2619.pdfIn PDF document text
    • http://makimibib.bluedolphinphuket.com/uploads/1/3/1/6/131637254/6997057.pdfIn PDF document text
    • https://site-1042453.mozfiles.com/files/1042453/xepabakanened.pdfIn PDF document text
    • https://site-1039182.mozfiles.com/files/1039182/rudiwiwuvila.pdfIn PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/78198216799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/l_j_shen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5160/5927/files/xukukosipabozewez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/gewaxuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4206/8897/files/26998655405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb87a9d2-11fe-4eea-81b8-7c87a632e889/dezuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b025e79-f50a-4be7-9374-a9dbe3144886/namoxaxowu.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_off00006533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 5660 bytes
SHA-256: 64590dbd7f71863377684ff75d507667ae8b244a35b6cc5980f19379cd3290a0
font_01_sfnt_off0000784b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 9984 bytes
SHA-256: 61518a36159fb3fb133ab186938448500aca112058702b52602a5801efa9d876

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