Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e921e231975648c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 04:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3ae221551ed666ae9e129b24a02c57b6 SHA-1: f48cec7872cbe5284d8efef37073db77d6205794 SHA-256: 1e921e231975648c9220aa93424c23af2959b0dfb4c08532ef6923d9c77f0f14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious or unwanted content, masquerading as a free PDF download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=les+vacances+du+petit+nicolas+pdf+gratuit PDF link annotation
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/gifipifi_fazamok.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/jujexuzapotoviz_misagowubegulo.pdfIn PDF document text
    • http://ita-yog.space/crack_renee_undeleteronoqj.pdfIn PDF document text
    • https://ferijivoko.weebly.com/uploads/1/3/5/3/135327637/kakozewasegu.pdfIn PDF document text
    • http://azules.ru/mad_bullets_mod_apk_android_1294o7.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/e2a2a51172f09.pdfIn PDF document text
    • http://zanartcc.net/34964465936ulv7r.pdfIn PDF document text
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/miwewa-gisovujuxazok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373999/normal_5ff3f9a46ab6a.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/852071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_60527bc361af8.pdfIn PDF document text
    • http://epaytds.xyz/313850030677k993.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/degagava.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/tevowore_jukonuxi_guzisizogiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_6041ad4b3aa06.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/956185f3-9469-46fc-8c36-b19dab5acaaf/how_much_chick_fil_a_franchise_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9572be0-efc4-40be-b082-e83f4c17c558/73797203641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04fc9e1-ab97-47df-8f2e-78ae301e7a2a/mtd_yard_machine_lawn_tractor_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61c5d99-9af9-48bd-bded-826d27212bbf/rezakidomesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70828e5-27fb-44ba-85b4-fa89a0883f4e/tenovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132c5f64-8fbf-4650-93ec-a481108da54f/does_tris_die_at_the_end_of_allegiant_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151b0ce5-6530-4877-a3f0-c77bab85658d/nabaxikometud.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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5324 bytes
SHA-256: f8e4be4eeb738865c988740b4083d65e545e3e16f4e6a7cc7305fc3fea912d59
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 11776 bytes
SHA-256: 35d39e182f6c023a1e1b49e46152b7abe745ffeab24b24802929424ce700a58e

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