Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c46d666f5c3926…

MALICIOUS

PDF

49.5 KB Created: 2020-11-08 01:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 08032d14ad057322a41489426169114b SHA-1: c4ef2eff3e1f78fd503d986e436c8c4cfc53514c SHA-256: a9c46d666f5c392677c4117d8762fe60d5d0d0843d2deb7c4b4541f03ce8549d
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://trafffi.ru/aws?keyword=recovery+version+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423732/normal_5fa727caa2cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_5f926cff00779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f8c08ad5c211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fa6d7042f40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5f94cd6fe2453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fa72e3781960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xamizujoxi.files.wordpress.com/2020/11/present_simple_present_continuous_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67f8691-f2f4-4ac3-9797-a3c65204adf1/xizujowuzejufebofoleba.pdfIn PDF document text
    • https://pupejuw.files.wordpress.com/2020/11/rutuwefopelewuson.pdfIn PDF document text
    • https://pobinawuze.files.wordpress.com/2020/11/zejijuvezajawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdffb51-e5ca-4d9d-8ab0-ddce7416d071/pajigalodipumik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea3ea85-c76d-46db-8687-403fee986b3b/43825976779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3ec45d-6896-43da-a5f5-f360f676fe0a/29117055436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d52f85-130b-4b0b-bca0-12f8a99ecf59/how_to_collect_visitor_recording_in_fortnite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55ececf-de4a-4de5-9d3e-bbad8686fe45/food_inventory_template_google_sheets.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.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_off00006cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF4 3560 bytes
SHA-256: 37f4deec4e8058f4ce6b61c411219cbea4de8f4e6905a2b41a01e0ca3f14b823
font_01_sfnt_off000079dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 4752 bytes
SHA-256: a24eafe4802d84f67dd96643a1372917ba2458f638557694b2047eea10a18b1f
font_02_sfnt_off00008a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2C 14960 bytes
SHA-256: 6c55f8f03de99cd3e721ee107d24308e4ac2696c354d3d69c5f4212a2f12353e

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