Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ee066b2d8949e1…

MALICIOUS

PDF

96.7 KB Created: 2021-04-18 03:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 99641e714ed4830d53e681efb71f03c9 SHA-1: 90bc24ae21dc8b48eb25905b20d5a38e00deeff1 SHA-256: 90ee066b2d8949e161453d5cea3d8e9a09ceb78d2077dc7ebc24923e99684892
186 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One of these URLs, 'https://jumiwimov.ru/strik?utm_term=microsoft+office+365+macbook+air+m1', is flagged as unknown reputation and is associated with a heuristic indicating a potential phishing or malicious link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=microsoft+office+365+macbook+air+m1 PDF link annotation
    • http://paselon.getenjoyment.net/hansel_and_gretel_bakery_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_6066f8ecd49ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fdb100b3d382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fe2081d8a0d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5fcc764b98e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_605bf91eb08b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_6048f75960b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_601ef0dbe5ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_6032258e44658.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/fb0071b8-a890-472a-b1fb-d7ebb939a4bc/how_many_pages_is_outlander_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48aa8d3-6d9b-4bdb-98ca-dd7353c43e1f/french_to_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b18188-5c75-4820-aa7c-620094898915/what_is_history_of_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37181186-b6b6-4c43-b32a-57680a9fc627/95391030143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858f07f6-0060-431b-ade0-7e5b682c90c7/what_is_the_formula_to_find_the_surface_area_for_a_triangular_prism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdf737d-c748-474f-81d6-59df08579b7f/norton_reader.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_c27baf51023d4ee6862c842cd1652e60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e05849-def0-499d-b341-bef68f3cbe9a/68620969446.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_36f0c5eb33da4b2f8205f0cfc4cb3073.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba02437b-e586-4313-8ff9-30610f5aca3d/lagerevowofemin.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/4647879299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d80863-8e80-4049-8e15-ce80ca5ae28f/are_old_swatch_watches_valuable.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_5e6d78a2184c43dc8720db2d1006d760.pdf?index=trueIn 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_off00013c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 5700 bytes
SHA-256: 10fa0ab39f9bf51f8a7af6eeffbeeaaf35b98385b8ca7961c8e129fe7dea776f
font_01_sfnt_off00014feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEB 10884 bytes
SHA-256: 318e05cbe4e8f4368263a2dcbca26a289417d000ae5b560e2c95596fdd4ad36c

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