Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf692076a3a764b9…

MALICIOUS

PDF

63.9 KB Created: 2020-11-09 08:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c71d12416237511143b63ec4f42f09e SHA-1: 2986abcecce4e7a06bebcd699b1f29c83c44346d SHA-256: cf692076a3a764b9fcd2f43ac0d520dd837f7938cccfe80fe22177df4ab98083
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 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.
  • 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://trafffe.ru/123?keyword=dsc+degree+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5f9dcc0fd297a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f8d947845543.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/814d1c0.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/kifapukakef.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/5d6d01d62b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://kufotukir.files.wordpress.com/2020/11/rafubaf.pdfIn PDF document text
    • https://zegimok.files.wordpress.com/2020/11/jozotegosoda.pdfIn PDF document text
    • https://tibepitetuj.files.wordpress.com/2020/11/81834172152.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/poultry_hatchery_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/little_virtuoso_baby_music_center.pdfIn PDF document text
    • https://sidevawaz.files.wordpress.com/2020/11/zewufefekafokelatebivevo.pdfIn PDF document text
    • https://wefufepolo.files.wordpress.com/2020/11/72162868323.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/1336207999.pdfIn PDF document text
    • https://zavuzujovati.files.wordpress.com/2020/11/data_analyseren_en_programmeren_met_r.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/bubetevimasixil.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/86730732843.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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 4736 bytes
SHA-256: 14b1b4fe0405bd52690a17c45ca14108dd2bd89e465b55ce0baa43eab37a9dc5
font_01_sfnt_off0000c0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B2 10368 bytes
SHA-256: cb6f1ef81465ed205ead155476d32ee0a88f1cbcde1fe6e5842f568970020c29
font_02_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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