Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6dbf83e1850c13…

MALICIOUS

PDF

42.7 KB Created: 2020-11-07 17:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 4886f16c373583fe47a44ddfd468779f SHA-1: c3b09425ed057fae26d85d1fe2251974870dbdaa SHA-256: 3d6dbf83e1850c1343af29e447d2df28e3094dc6e6bec673bb01f74c36465ca4
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://traffset.ru/123?keyword=american+express+confirm+cards PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388282/normal_5f8f61d1b1faa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5f9ad417d5212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f924a7ceca10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f8af420e28ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fa33361c50b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_5f9902202300a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f91e6aa8d7ec.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/73dd2e15-7659-4c46-9e0b-d7e6cd3017d1/bodum_burr_grinder_instructions.pdfIn PDF document text
    • https://rinuwax.files.wordpress.com/2020/11/1149196868.pdfIn PDF document text
    • https://danuxowifoka.files.wordpress.com/2020/11/97926079603.pdfIn PDF document text
    • https://xadomozamafa.files.wordpress.com/2020/11/xafadisivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa11ba38-3070-4a9e-be47-8aaf5df25e6e/mefegepabozaxejexafupowoz.pdfIn PDF document text
    • https://liwefibago.files.wordpress.com/2020/11/46096501240.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.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_off000066d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D9 5324 bytes
SHA-256: 18b36a9c210bf1a99217e88d585dc70bbfa0a7395da1351a18b1879ae985d4fc
font_01_sfnt_off000078e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 10584 bytes
SHA-256: 08ab898d0619f81752d671a7a5b1628df4ab612985f3452b35287af959486d3f