Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98fbef29c741b12…

MALICIOUS

PDF

40.7 KB Created: 2020-09-30 14:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 0337288a24e6a425afae492a2478d5c4 SHA-1: df80baa44280b1ca06042d31f9cac99c6fbd805b SHA-256: c98fbef29c741b12b79255ad50aaa207a0dab5adac5fa77625d718bb2065b5d6
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://cctraff.ru/strik?keyword=complex+sentence+words+pdf In PDF document text
    • http://files.nomsieswoodcrafts.com/uploads/1/3/2/8/132814518/tawimadav.pdfIn PDF document text
    • http://files.marksmobilehomesupply.com/uploads/1/3/1/3/131383434/9020198.pdfIn PDF document text
    • http://files.fvapbotb.com/uploads/1/3/1/4/131438464/xagatilidoto-duteg.pdfIn PDF document text
    • http://files.wouldgodmilkagoat.com/uploads/1/3/2/8/132814900/7e530df.pdfIn PDF document text
    • http://vufoni.michellewatt-educator.com/uploads/1/3/0/9/130969724/kujok.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/73232417026.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/85565937970.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/bemukasasoxuvov.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/1/0430/4545/3985/files/pimomotekiliwojepopuweg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8476/7647/files/88507862018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/bhagavad_gita_chapter_15_slokas_in_sanskrit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8894/0707/files/sejigituxunepaxulaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/nikagulete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/zetebipanoxusiv.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_off00006213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6213 5156 bytes
SHA-256: 528e693bd4d6540f1a81ff0dfa588b4f17f722314cfd868b631c94f2878a473b
font_01_sfnt_off0000739b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739B 10148 bytes
SHA-256: 0928e98d8141c1cda7180b97728ed30694ef1f70a4bbd9d47e6817f83062757a