Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68c769ef1b90728…

MALICIOUS

PDF

73.6 KB Created: 2021-03-23 11:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bccc9f7fcdf18217cb053e63d9c58eea SHA-1: 274b93d80684c9a3a5bbf451deac8a381c81bb1f SHA-256: f68c769ef1b9072854775a797c01540b594dcb5a202859539a40bda20beef721
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links to other PDF files, many of which are hosted on disposable domains. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=health+psychology+an+introduction+to+behavior+and+health+8th+edition+pdf, which is likely used to redirect users to further malicious content. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=health+psychology+an+introduction+to+behavior+and+health+8th+edition+pdf PDF link annotation
    • https://gokasesebigi.weebly.com/uploads/1/3/3/9/133986942/gewuravek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367279/normal_5fe57f254722b.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/history_of_two_cities_charles_dickens.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_603d529643d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_601d68b7e7785.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/90965218756.pdfIn PDF document text
    • https://guzudefadeberis.weebly.com/uploads/1/3/4/6/134639139/pibabesa.pdfIn PDF document text
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/xusaxo_tegag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_6029fff0389d9.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/59688129495.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/8112a04e-cd54-49a2-bdf7-47db5765889f/wegiziguvevimiwidov.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_d869c68b0ecb4efeb79fff78fc1d7773.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_8fdb780a3575472f853d4a5682a11ea3.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_3730c3ecebbc4977900aff05b9f6a988.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_1c1a6904e7ab498c90cf208dacb52f20.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_99fc5878a10d49518ca02ca564cb1c5d.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_a73a8c8cae0e4170af2df310a62e1efe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3028d05-e4e9-4806-ab57-631cde51a8d2/interpreter_of_maladies_by_jhumpa_lahiri_analysis.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/greek_mythology_in_byzantine_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf5da5a-7c78-4f78-ae89-7778cd30d348/60588551432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a25439d-14b3-4a43-accf-19822d4b2fe1/how_to_make_your_own_house_in_adopt_me.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_1edb39b9e30f4e0aaeaf9af86d59e4dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8f6597-9f84-46d1-8f01-75434435bcef/61550881152.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 5876 bytes
SHA-256: aab07f15a6cfcb5dd7e89564e7aa5a45dc62a37801f8e95cc4d5ddc0ce260c66
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10964 bytes
SHA-256: 90b43c490e930626d635772804c8982eaa2e0165ac4cd21f6fbad80283fdbc47

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