Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbeacebd147fcc4…

MALICIOUS

PDF

96.2 KB Created: 2021-05-20 17:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 96f49559c4277ee3872b54b738998bc5 SHA-1: 220da179473cdc89f5d36ce1c6cada64a69dd4c2 SHA-256: 5fbeacebd147fcc4dfce0991c8085193ba065f71b51d61f3734a554bf840a35a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the PDF structure are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/strik?utm_term=ingenuity+bouncer+weight+limit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421640/normal_6061161ea526d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd24f2ea2148.pdfIn PDF document text
    • https://birifukuko.weebly.com/uploads/1/3/1/4/131453348/797b43896b5e4.pdfIn PDF document text
    • https://xabejelowubi.weebly.com/uploads/1/3/2/6/132695530/822b7.pdfIn PDF document text
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/bf1faf68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383446/normal_6003db9f09806.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/7161757.pdfIn PDF document text
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/2345017.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/0195c94c-083e-48b6-9e1b-3365439de370/economic_development_definition_ib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65b0133-f143-468a-b3c4-45d1bdc54b07/lurufemidato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61228433-d005-44c8-bf13-7e3745e1bcbc/sewing_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d24329-8ef5-469c-b100-7d24a2e50eda/90595548126.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/34795003985.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/value_education_class_6_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/53507222248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94988b5-e0d7-4ec7-97fd-f44f353f461f/gerazelif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c1ad9d-b181-45db-8b32-57a79ac7a556/6565163033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82beb7a0-e1a1-4962-a1fd-2eccb1809806/cant_get_my_thermostat_to_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d36127-d24b-4e71-bf63-da859d54f056/fesazuvugamu.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/80190364895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd83ea09-9795-4c07-aaea-ccee84f45e26/is_adjustable_base_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/how_to_buy_a_rental_property_with_no_money_down_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c1c5dc-c9a5-4e81-b953-2aa72a2d2378/who_provides_tactical_combat_casualty_care_tc3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fa0ec8-71ec-49af-86d6-e89e9a6753ee/are_2015_ford_mustangs_reliable.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_off00013a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A44 5096 bytes
SHA-256: f39a24f6967d69e9c3ae7546577680bc805eca4c4dadb5f0d421946980881aa5
font_01_sfnt_off00014b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B91 11328 bytes
SHA-256: b0be4d2d3db9398e26963619b6257c27086a7d6cb412cecbfa95989e326b8b1e