Malicious PDF — malware analysis report

Static analysis result for SHA-256 853b0770e9eac084…

MALICIOUS

PDF

69.7 KB Created: 2021-06-01 15:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0efb0375a77b77608074910f19631475 SHA-1: 77763b123b0f061b142133092a8697a5b7281f6c SHA-256: 853b0770e9eac0848791cba564a61ff3dde6cc0642d47ff305728d8270b87a2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=when+should+transformational+leadership+be+used
    • https://tujuzixokizaw.weebly.com/uploads/1/3/4/7/134738061/61e4ca04f1.pdf
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/wagifanidared.pdf
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/gemuworosujora.pdf
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/kilozos.pdf
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/nijiziwanelokinefen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e7ceabf9-67ba-4e08-823a-8c21b818dd01/57915389503.pdf
    • https://uploads.strikinglycdn.com/files/8843c10f-a274-42b9-af5c-9b1b8eb12feb/accounting_tools_for_business_decision_making_6th_edition_answers.pdf
    • https://uploads.strikinglycdn.com/files/c43916a1-a331-4fce-bc20-09c0b23d598f/best_dd_adventure_books_5e.pdf
    • https://uploads.strikinglycdn.com/files/3e89b686-e7bf-44da-ba44-544f2d0b6225/52195454093.pdf
    • https://uploads.strikinglycdn.com/files/1e157eda-5635-4695-af0d-9ed11abc33c6/22813544163.pdf
    • https://uploads.strikinglycdn.com/files/81bf4e8c-4461-4517-99bb-238dbc90f895/dungeon_master_tools_dnd.pdf
    • https://uploads.strikinglycdn.com/files/ff94fecf-b57c-4da9-9e2b-5ffbd9d568c8/85631557808.pdf
    • https://uploads.strikinglycdn.com/files/7d499daf-ccaf-429a-aa8d-2f9888f2f966/bulemalejitajalapujadi.pdf
    • https://uploads.strikinglycdn.com/files/d025a305-1309-44ae-b688-3bf295618eb9/1096953454.pdf
    • https://uploads.strikinglycdn.com/files/d583771d-7101-4815-9212-20853ff9276e/viremujatewopexadida.pdf
    • https://uploads.strikinglycdn.com/files/3b9f8660-b0bd-4960-8e90-81404d019c7a/philosophy_of_mathematics_best_books.pdf
    • https://uploads.strikinglycdn.com/files/3446cf1f-297c-4299-9bb5-881297e907e6/mini_international_neuropsychiatric_interview.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d539.bin
bf0d73f03518b31003d5f97b22fdb59cea00143b2693355f669ccfd8a0e6062d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 5436 bytes
font_01_sfnt_off0000e78a.bin
6110ac13e202cc39b61a4a247ccddf3b0709961dd01be10660932775df2172e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 9988 bytes

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