Malicious PDF — malware analysis report

Static analysis result for SHA-256 6590d14624d5febc…

MALICIOUS

PDF

77.6 KB Created: 2021-05-07 02:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2db3d9d31246cea734ab1950f4ee9161 SHA-1: aa2f1cc2973988db8bdac244b6abbe457a8440a0 SHA-256: 6590d14624d5febc3b67b2d8ec9329eb475928eeee4dc79264d791b938955d33
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9991

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://vilenefex.ru/strik?utm_term=production+weekly+mandalorian PDF link annotation
    • https://cdn.sqhk.co/xukonobos/hjihLog/candle_light_punjabi_song_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5ff4ce7462b6a.pdfIn PDF document text
    • https://dewokazivefin.weebly.com/uploads/1/3/1/4/131437233/woduxufukebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5fd0c3735b0eb.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/lewarepobafazov_fodaposig_konegor_vepesunoju.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/77f19208d.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/7230657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_6056856583508.pdfIn PDF document text
    • https://balevowoperat.weebly.com/uploads/1/3/1/3/131397989/5659521.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/btidihX/zuduj.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/3eaa1288-78bf-4753-abea-90455fdd1300/nemexugakipazator.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_f2b4ab6a83ad432fa25e55a44c70cb35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b296730f-4f96-4084-9e4b-8ecbd2328dac/tus_zonas_erroneas_resumen_capitulo_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa3550c-2d58-4f00-bb5d-a0ef15b1f823/fozegosimavojosoxiruvil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab760d9-63d2-4b7b-a1f4-e42d22f5606b/2005_toyota_tacoma_radio_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef658911-f1c8-4b57-9300-8256374138ea/xobotuzizuwezegita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791dcb50-d990-4d66-a027-5c60a76df107/eiki_projector_lamp_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a3aa3b-1c17-46cd-958c-8417543939dd/jufof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91caee4f-3c6b-4e5c-b1ca-5aa53f2a97b8/1018217582.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_8f3df383f37b4c0c978f218cd4b14bec.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_796f41c3261a4dc4af624dbc8882853c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54af1123-327e-4bde-9072-acc08024b538/shark_rotator_professional_lift_away_owners_manual.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_689cb333b83a4336bbf0aefcb68a56e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0742bb7b-8e3b-489b-a86a-14577450782b/xuxovenixa.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_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 5164 bytes
SHA-256: 8230d8c304f7cd020ce3341c36d4e14a8e777df67bd63754c4753202a882be7e
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 10560 bytes
SHA-256: 2bc389e002392e7e6a7bbd5861bbe29e4870d95b2c4ca64cbd45192a729166f1