Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb3c1e38e59bb8b…

MALICIOUS

PDF

58.5 KB Created: 2020-10-13 15:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c328e0ebdd761f19ac966490190f5440 SHA-1: 8069419692b8db56d2ea33f6017ea384e5a08f74 SHA-256: 5eb3c1e38e59bb8b83d5ccba1c826275a85d80f013ab35a8e457ab5cfca7b645
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=pediatric+bacterial+conjunctivitis+treatment+guidelines In PDF document text
    • https://site-1043169.mozfiles.com/files/1043169/84208077541.pdfIn PDF document text
    • https://site-1043805.mozfiles.com/files/1043805/79105540646.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.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/1/0484/0413/6093/files/87529636045.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7255/2601/files/nakipizedal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9699/2663/files/iron_river_mi_weather_radar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2427/5866/files/greater_new_haven_baseball_league.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bb381c-98d8-4745-9239-8fbb656e4bac/bebevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee01745-0807-4971-bcaa-5dcf9dc1363b/77939902523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048a6280-d643-4b4e-8fd5-66a7e4a11610/4380402671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05ac789-69aa-492f-abdb-ed4e6fe4c923/36142886085.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_off0000a4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BC 5536 bytes
SHA-256: 28040842ca6f486155c7599c24d28f72794eddfefbfdb4c32b7b6f3c53ba4e4d
font_01_sfnt_off0000b77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77C 11216 bytes
SHA-256: 5bf5135a34fe5b70480d116231199227fd94bf0bf20a5b36d270c8fb3aa9a7d6