Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a4e64998ecc8f8…

MALICIOUS

PDF

73.7 KB Created: 2021-03-20 10:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bcefd4cf0e250beff25120504e350026 SHA-1: 95ad23f4e195aa0d092c9ece0d24ad71e09bd67a SHA-256: 28a4e64998ecc8f8fc4c061ff30719a57386dcc3d55aefe902c44e1bd9357583
126 Risk Score

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 0.9996

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://maypoin.ru/strik?utm_term=is+bh3+a+strong+electrolyte PDF link annotation
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/jepitusorewebitemuma.pdfIn PDF document text
    • http://smartycredit.info/django_website_templates_freek9qxb.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/whatsapp_wallpaper_hd_3d17g4c.pdfIn PDF document text
    • https://segukikiregitep.weebly.com/uploads/1/3/1/8/131856439/guxitepulibes.pdfIn PDF document text
    • http://demask.space/nervous_conditions_tsitsi_dangarembga_ebook_downloadj3ono.pdfIn PDF document text
    • http://fitojijumuta.22web.org/moscow_tourist_attractions_map.pdfIn PDF document text
    • http://wellwork.site/raider_origin_adqgdz1.pdfIn PDF document text
    • http://lightly.store/jumpsuit_wedding_dress_with_detachable_skirt41k16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_ee0f7e247b1642daba82d229e30ebb6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/50432046600.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_5ca3efa62e50418b9344704c035f43c0.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_0b03a5447aa74171bf2e09e562e77960.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/affinity_publisher_magazine_templates.pdfIn PDF document text
    • http://mabukivo.epizy.com/53900422299.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_2ec531471e894bfdae72dfd541623826.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/42379067534.pdfIn PDF document text
    • http://galojuxutiwas.epizy.com/pulubarenefozaxiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/vebidukazigobamidedi.pdfIn PDF document text
    • http://pivefev.rf.gd/88109076113.pdfIn PDF document text
    • http://pomefeneliwawe.epizy.com/booty_band_workouts.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_737a52e821c340eb89f9ba82495d28bf.pdf?index=trueIn PDF document text
    • http://wemazepiba.epizy.com/43554095067.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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 5404 bytes
SHA-256: 3fad11dcd69faeaff81bc867f2954a0d84af03220581e51de9dd9e46f8b7e7db
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10556 bytes
SHA-256: 1083cda5a5e4d54c216d99e86c1f3aa4f244ed5e5fdc107142c7e05e53caacdb

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