Malicious PDF — malware analysis report

Static analysis result for SHA-256 824ea57b21adb391…

MALICIOUS

PDF

45.8 KB Created: 2020-11-08 10:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 42778c1afd476106f98b8e5d9b7e5121 SHA-1: 860bbf7f02dee7d26a75fb067dd0d03b7b101796 SHA-256: 824ea57b21adb3916112f34cf9d028816c56a24eb53b27fd9236b2ac584a24b9
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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/aws?keyword=hoa+huong+duong+lun In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f8bd7d9e6070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5f9b6efe1b8a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8faa3997a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_5fa49f91c8d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5fa1eef054c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fa539c45699d.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/rotowan/dana_300_twin_stick.pdfIn PDF document text
    • https://mudupetem.files.wordpress.com/2020/11/40043924524.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/pancreas_endocrino_histologia.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/xogadewalojaka.pdfIn PDF document text
    • https://dolaken.files.wordpress.com/2020/11/28812882385.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/degree_of_polynomial_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/nesogutus.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_off00006b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1E 4772 bytes
SHA-256: dbaffed72a864e4165da694d80e8d16afd997535ea245d38b69744dfdd6c4ecd
font_01_sfnt_off00007b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B54 19988 bytes
SHA-256: f8502d5f094c801ae6643a30ddb48e1b792f7cdeca9d1652e9fc31ce0a5b6f01