Malicious PDF — malware analysis report

Static analysis result for SHA-256 40440ce189772b5c…

MALICIOUS

PDF

39.4 KB Created: 2020-11-05 23:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0d1028d141e9e79d1495bfea6e2e0e14 SHA-1: 69bb2c6352ead7135bc73c95f23e3f782da3315d SHA-256: 40440ce189772b5c844646a313cc16dc0bfce109fdb067b8ad07d92f0670529d
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=google+case+study+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453556/normal_5fa2e0ef59e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8954a58b796.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/06494347bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5f9f73670cae3.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/porikujeluzad-pojuzogiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5f991ce38cf16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_5f9dc8f21eb3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f91f7e39633d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f970a3f6642c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f91e23de8bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5f9e590e5ba8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f8904a3232f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5f8cbc2bef9e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5f9a3b5e95bb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/chapter_14_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/27372052453.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/what_is_search_engine_marketing.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_off00005a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A72 5360 bytes
SHA-256: 62a89a694ef7519950966c0c26ca1dc88e5c4f1448fe32c38ce40ee67601bb6f
font_01_sfnt_off00006cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD8 10580 bytes
SHA-256: d399f04db405633c20b628722fe67a17562cdc0e8646e2fa566c867bebeb8a85