Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ca2f38582758db…

MALICIOUS

PDF

51.7 KB Created: 2020-11-06 15:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1758c8d231ed2bc31c5f70db7dafc275 SHA-1: 4c0d76950898772039a1f7fcb137b3c832570329 SHA-256: a5ca2f38582758db28940df3804e9acd7ab772f9246626913946b10014ffdd0e
96 Risk Score

Malware Insights

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

The sample is a PDF file identified as a credential phishing lure impersonating Amazon. It contains an embedded URL that redirects to another PDF hosted on weebly.com, which is likely the final payload or phishing page. The ML classifier strongly indicated maliciousness, and the SE_BRAND_CREDENTIAL_PHISH heuristic confirms the phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/e3f8098.pdf.
  • 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://trafffi.ru/123?keyword=words+that+start+with+plane PDF link annotation
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/e3f8098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f8c9d0784c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f87f88a440b9.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/4ac790a58ebd.pdfIn PDF document text
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/savazatite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/neviwove/xanathars_guide_to_everything_else.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/ffxi_thf_gear_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/lafot.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/19632888109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609ac3c4-5d4a-4d32-90ff-3ffcf530590b/67515307827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900eea7b-d970-4f11-b6c9-826e04871e2d/39107153559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98b8429-844d-45ae-a27e-cc414d8562b2/roduxetozavetorumuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96addf1a-9551-495f-b77b-4a99f48b6051/razenumazowe.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/34582441317.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7535 5152 bytes
SHA-256: 29392dbdcf24ace711ad117bd5f0a6405d911d7eda7b10314c928e5103e2603b
font_01_sfnt_off000086cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CC 10888 bytes
SHA-256: 5f0531884ff6f5303ecfe7e08cba84390ac77ae38feeea2a8c9a4200197d828c
font_02_sfnt_off0000ac44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC44 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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