Malicious PDF — malware analysis report

Static analysis result for SHA-256 c921b5f36d32ee95…

MALICIOUS

PDF

41.5 KB Created: 2020-11-07 13:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 92f917cfec26dbea5735b61a46d034fc SHA-1: ae099f6a42e6c6f4ca2d2b3ea68d9273fc23188a SHA-256: c921b5f36d32ee95aa9be232ea48e63d3f4171dbdc542fe3fe653042d5674d1f
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with a primary malicious URL identified as 'https://trafffe.ru/123?keyword=words+with+letter+p+for+kids'. The heuristic 'ML_NYX_PDF_MALICIOUS' strongly indicates malicious intent, and the presence of numerous external URIs suggests a link farm or redirection attempt. No scripts were extracted, but the document structure and embedded links point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafffe.ru/123?keyword=words+with+letter+p+for+kids PDF link annotation
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/liner_bepekefovuzow_mipudu_bajit.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/remuv/75970358487.pdfIn PDF document text
    • https://sebuwisawos.files.wordpress.com/2020/11/fipupojuretis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecdd1df-bd91-4cf6-9010-0cf83219cde7/lainitas_mexico_ejercicios_complemen.pdfIn PDF document text
    • https://pufelaneniw.files.wordpress.com/2020/11/14095601158.pdfIn PDF document text
    • https://wobonil.files.wordpress.com/2020/11/64447521224.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/45929280583.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/adobe_apk_file.pdfIn PDF document text
    • https://sipodugegir.files.wordpress.com/2020/11/80011902448.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/74198869779.pdfIn PDF document text
    • https://davitiruwax.files.wordpress.com/2020/11/fiche_de_lecture_l_cole_des_femmes.pdfIn PDF document text
    • https://nixeporebumo.files.wordpress.com/2020/11/puxola.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/46685736657.pdfIn PDF document text
    • https://dowuwiridewe.files.wordpress.com/2020/11/sugoboralijub.pdfIn PDF document text
    • https://bajalafel.files.wordpress.com/2020/11/windows_10_user_guide_for_dummies.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_off0000641c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 5088 bytes
SHA-256: 0aa09c955d4c83ef597ec5fc49b933dc34f022d0a533780e8e5a15b2c5a7b771
font_01_sfnt_off00007581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 10624 bytes
SHA-256: 8c6b7b0180eed35eb3e8bc31ee6c51bd35d443ce2fe19bbff243ec3bb687d6a7

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