Malicious PDF — malware analysis report

Static analysis result for SHA-256 08173c5dc12f9d18…

MALICIOUS

PDF

41.3 KB Created: 2020-10-03 14:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6e5cd1bd3bfe2f561f27f1d0ead4ce26 SHA-1: 9f4e3af54afa59e934f0f8446346444d6df896a7 SHA-256: 08173c5dc12f9d189b22b19e981745225ac7246e23445173f81ffbad627ff71e
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/pify?keyword=fsa+algebra+1+end+of+course+review+packet+functions+and+modeling+with+work In PDF document text
    • http://nimafevum.mhscandifest.com/uploads/1/3/0/8/130873863/rimoseg_rezulezosaf_gavurezoxi.pdfIn PDF document text
    • http://files.izzyzaino.com/uploads/1/3/1/0/131070722/2383743.pdfIn PDF document text
    • http://files.mochiboutique.com/uploads/1/3/0/7/130775878/57479.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d250dc70-3994-4ce9-8905-c6d38fffcc51/repijoronur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b2bb82-a05d-4d74-85d2-9022a3620ac4/dubevotuvuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b428f6f-61d0-4650-aacf-86fdec0d7ad0/26530980216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0fcb21-c75f-4937-8fa6-1809999c2593/94994682868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/rogue_galaxy_insectron_feeding.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3511/7726/files/18800078705.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_off000060d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D8 5932 bytes
SHA-256: 143a50b4234a8b00ab7e0c29a2e1fe43a5f41bd4baed12a9232c14b712b6d8bd
font_01_sfnt_off00007500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7500 10308 bytes
SHA-256: 07cc119cf15a78364a736b524f48e4f1fd56d8d7f632b39fc4ccca7c13def5b1