Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec634e8121941e4d…

MALICIOUS

PDF

62.0 KB Created: 2020-11-08 23:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 99bfedbaaf62aeb1a9912e27103ff208 SHA-1: 2a3757c1b9c2b4b9a97289427d280c54c2d13d86 SHA-256: ec634e8121941e4d9d34584d918df30d651f414d4053e3ad4127cc614df1f51c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=revised+common+lectionary+2020+pdf PDF link annotation
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/sitibuweri_lowexireg_paluka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5fa51db0b1059.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/2582957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5fa362e762477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5f956f73dfb34.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/8fc4d6dc-655c-4f44-8623-f7d562c3678e/15542785806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2ae8f9-4c6b-4a08-b399-425140e4efe1/kino_bay_mexico_fishing.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a80b39fe-343b-4b68-8e3f-5d7deb316685/supermicro_aoc-sas2lp-mv8_freenas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cb84d0-b199-4b71-9041-7c6668c593c3/xbox_360_bios_download_for_emulator.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A41 5744 bytes
SHA-256: 05ec18d423f1fcacf87b4c9de6c6e8461d7c598095d8612d17bd9e53ccfc9623
font_01_sfnt_off00009dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCE 10492 bytes
SHA-256: 0537f76adc9f829cf56b477a960d06caa4b68b6a526ca64c7fe6eba61c95b773
font_02_sfnt_off0000c1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D1 24100 bytes
SHA-256: ecea7e99dc5d4bfb977e44628b93925b9f62b4d0f8e5f0f4e4f5d53ea22ac795