Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e42161ad9b39d5…

MALICIOUS

PDF

47.6 KB Created: 2020-10-07 11:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c18015328f4aabd27b261d25d50a6106 SHA-1: eb2223d4d947fc2192b052fa1449f1fc3524ca89 SHA-256: 31e42161ad9b39d5d69325afe6f934c5642ee2298360e54daeb39ee10fa1dfbc
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=tipos+de+sociedades+en+colombia+cuadro+comparativo+pdf In PDF document text
    • http://files.cheyennesheriffcolorado.com/uploads/1/3/1/3/131379205/1776746.pdfIn PDF document text
    • http://files.adultgleeclubaustralia.com/uploads/1/3/1/8/131857983/gedonopidet_fidegosa_dapazijita_kejigun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a93840f1-d408-4ef6-97c5-d3814cafd993/zezumafasepebowef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae583ad-a082-4250-b0d7-92edf570ba77/sajilabigaxuvonifutaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853b3a03-e034-4589-9698-e8d06f4b3591/bupalagejokexive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b32e53b-7a95-4750-af06-e34a25b3de30/sutodiwabekil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69bf3c6-daa3-4cf5-9ef4-e5ae13b32dd4/xuxakuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1409/3986/files/98314113308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3927/2341/files/51226623074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/94275208723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6381/1999/files/23474184270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9277ad-b108-4c46-b37d-992860f7529a/xedawilemazolujafosafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcac1785-8012-4161-a223-286daa742988/11631422113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d82ecd-2881-4066-9e72-2e31187bdfcd/zadodubawezafirejidepefab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3907b2f-43c4-423d-adae-6345c9d91878/devow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81b5f82-18f8-43ab-a33f-db2d6e93d89d/65967524218.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 5332 bytes
SHA-256: b03de3a9d1ddb3f1d7251f916ae0878ba26e604f240a39dc0ec293cd3f1682a9
font_01_sfnt_off00007cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB0 11252 bytes
SHA-256: 5ad4c0b5580347d653cc4190a5282686dc0554b69f9852c22752a6a5904769a3
font_02_sfnt_off0000a145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA145 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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