Malicious PDF — malware analysis report

Static analysis result for SHA-256 611d8343367e7608…

MALICIOUS

PDF

72.4 KB Created: 2021-03-04 16:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5cf364a26d511296820323f382c5e431 SHA-1: dcf64e8f1d3c5a660b726e980d07cf2bde7bd1b5 SHA-256: 611d8343367e760897df3bda75d28a6d04db9d2e6dc9cdedd6a0f580ede38497
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'maypoin.ru' with a query parameter suggesting a lure related to 'chainsaw parts diagram'. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and embedded URLs strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/123?utm_term=eager+beaver+2.0+chainsaw+parts+diagram PDF link annotation
    • http://subuxiwubemew.getenjoyment.net/2237353021.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hcgfcpU/lugefilobokugatuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_6033712d903aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60201b33ca824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_6018da39a8e84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450034/normal_5fcd7d5585761.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/giFdiir/27326576057.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/muvagejilibanukubebim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_601237c32b846.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/JpGI1ic/lovecraft_country_episode_2_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/rewaloxuruvu/Z7KkjhN/vazeri.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/Wjbggi6/mugamixalaxirupolif.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/ad83074e-639a-45be-b035-d86a0c2cdfc9/kisidupetulodutesomakurut.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_30e11fdcc40e41a4bcfd5d04a7352311.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1ae48d-a6c7-44db-a501-85625d62a6dd/faxizetotufo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/76011082977.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/long_division_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/washington_calligraphy_modern_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd51fbe-e92b-44c7-b678-f17b59b2fcda/xovulodojowigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179adb53-0266-4122-b06f-2aee9973ea4f/fagor_pressure_cooker_gasket_9_inch.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_6211b5e084c24f2bb4d9bbf49bb6a5f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a8cbd3-93cf-4615-b9b0-a3deca495538/sipimupopixug.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/77494705417.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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 6008 bytes
SHA-256: ab687b424cd061712a46521dcbde808ff4eb172dc014dd2f4d80b4625a399310
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 9948 bytes
SHA-256: 5cb11beee735dd737f2899373eede6904dd5310e3c36000311e4366be000d7bd