Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b1469eff8f0f7b…

MALICIOUS

PDF

38.7 KB Created: 2020-11-07 11:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 03c8c594861de796f32386a335a1f02b SHA-1: 1f0d54b10508396841322a5a2b70dfc247a578e4 SHA-256: a0b1469eff8f0f7b1197d8a3a1cc0ae9e7156694201780e833640bf43ccdf13c
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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.
  • 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://trafftec.ru/123?keyword=the+impossible+quiz+2+answers+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5f98170b8ce0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8a75641f-efe5-4746-a798-6801d7af84e4/darujokatisewizotilis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a710ac-6cbd-4736-bb0d-d25932ca7970/gagar.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/vamibenuwavizexamixuxel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e37d72-0de8-465b-b672-b0fa5b5cd0e8/zoduvofodilolijif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4140d3f-a687-47c8-9ca8-7a568da25b95/buwinonolomejajosasamumer.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/certificado_medico_cruz_roja.pdfIn PDF document text
    • https://madosoze.files.wordpress.com/2020/11/kiratolizewevebodanaxikam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee41aae1-4f0b-450b-8581-5441464607b8/1237728288.pdfIn PDF document text
    • https://zegimok.files.wordpress.com/2020/11/kikupabadekutipinukel.pdfIn PDF document text
    • https://nerukubukob.files.wordpress.com/2020/11/danod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47BF 5400 bytes
SHA-256: 45f5b95b1c848567910c63d2bb7b26fe588a128023fd1489e070ca62724daaa7
font_01_sfnt_off00005a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 11148 bytes
SHA-256: e4ae0309a3eedadc7af2a29da40710e7861ae339c4c16436da4705d86ead67b5
font_02_sfnt_off0000801c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x801C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333