Malicious PDF — malware analysis report

Static analysis result for SHA-256 940702b8cbeae81d…

MALICIOUS

PDF

75.9 KB Created: 2021-05-31 18:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ac676225407965dc2aa577ab54d119b SHA-1: e5c1591fa4dda22feed08a77a537c94e99b4ef7e SHA-256: 940702b8cbeae81d9a08c35b01512260127134cdeba6cbbc25be6d26766221fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/123?utm_term=any+video+capture+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6030e5e1ded08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6026eb8a78956.pdfIn PDF document text
    • https://rakimazigikan.weebly.com/uploads/1/3/2/3/132303322/rigovofakokuju.pdfIn PDF document text
    • https://ruxetire.weebly.com/uploads/1/3/1/3/131379726/dafubunefoj_ludon_soxesek.pdfIn PDF document text
    • https://saniwuladekogek.weebly.com/uploads/1/3/4/7/134759819/04dc6ff39d.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/sinotow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5ff926ea2fff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_6019ae995fe83.pdfIn PDF document text
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/9735340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_606ac5588f6d6.pdfIn PDF document text
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/128b27dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5ff2e025770a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fd5f2e77f658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_6029dc36516c8.pdfIn PDF document text
    • https://fetuxugov.weebly.com/uploads/1/3/4/6/134655394/5bf5eef976.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/b45a2213-9f4f-4362-a42a-a2c1c674e89a/tawoxolubegiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8257fc6b-7051-4501-90bf-22a9aedd7950/dbq_causes_of_world_war_ii_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272d70c6-df7b-4a6f-9168-f0d537a7bcf6/short_summary_of_daisy_miller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a72750-c825-4b5b-a658-99aed451bc3f/schaums_outline_of_probability_and_statistics_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b705a92d-cc35-4706-95a6-0de7f6609fa5/76780769883.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5092 bytes
SHA-256: 1ecc00417926e3dad985d3857ccf29d7625ba7e0f4f524312a3ed04cc7263c78
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10568 bytes
SHA-256: 5328f87bab692ac5c511ef335d02135263955ff664af66519967f0e1f3f06fdf

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