Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1833e5ea9a0a8e2…

MALICIOUS

PDF

40.4 KB Created: 2020-10-10 04:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: f0044039a44b6635978e9715f5ff9707 SHA-1: 9d33629fa381976dd64d60fdc4f7627960cd2f83 SHA-256: f1833e5ea9a0a8e200323e1878a5755573398e5f2a3b9c6344afba86e72337b0
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ggtraff.ru/strik?keyword=robert+wood+johnson+medical+school+address In PDF document text
    • http://files.carrolltonny.org/uploads/1/3/1/6/131607683/lunovulaxaforip_kavodokinuri.pdfIn PDF document text
    • http://simalusan.annamhenderson.com/uploads/1/3/0/8/130814328/kitekiropikemi-fokolaxafom-diriretativeg.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/1/0495/9725/1748/files/southeast_raleigh_elementary_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0923/9972/files/kefka_ffxiv_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0971/9965/files/fibodilelotivilisedereb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7814/6462/files/xafotetama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2725/8270/files/architects_scale_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/1478/7740/files/sonodomegikogizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6645/2896/files/10534822175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/fodotazukagis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/etrex_12_channel_gps_manual.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_off00005d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D52 5492 bytes
SHA-256: 6722eb9024c6d688e3cd2bc3788fa3d40c8dd6d80423e91fa852e1d61e52bad5
font_01_sfnt_off00006fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 11148 bytes
SHA-256: eb120a8da8c432b72949f19bf2d061e7140433172a721a981ac3a1089a4c63e2