Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e473e7d6cac5392…

MALICIOUS

PDF

77.4 KB Created: 2021-03-07 21:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 97d673ec9e760b1b7bc54a292a9bff8c SHA-1: d43a715883ae5f0a79df6eb3afe1c19970d96db7 SHA-256: 2e473e7d6cac5392b572dd06d377bc6fedcda7c5213b7a58469ecf23408ed758
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links indicate a potential for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://seumenha.ru/strik?utm_term=d%2526d5e+monster+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380078/normal_6030dd95a5036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fd653e06a1a9.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/haruki_murakami_norwegian_wood_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5feb78b07956f.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/79727604487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_6043095b4d729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_60325af1d859e.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/lenovo_thinkpad_t430_i5_16gb_ram.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/what_bachelor_degree_for_interior_design.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/99998079857.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://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_8e69d314ee5d4ff48e29d42538969564.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/24261431346.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/diferentes_tipos_de_aparatos_y_sistemas_del_cuerpo_humano.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_47d313f656bf4714882ca1106267f2ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/atonement_2007_full_movie_hd.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_dbc0cd2d9d914e80a6dada85d5e651bd.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_969ccbb4dad84df9ab432b50ba11c2de.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_5e115bfc8cbd46a493add244a060749c.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/book_report_form_8th_grade.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_cbe84874b1604867956383fe9c2bc9d2.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_a6531d7c946147b39593be307a9aff0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/allied_movie_300mb.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_ac91fb9401f940bfbe8b75eed9bc3e21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/suzilapevo.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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 3484 bytes
SHA-256: 7ae7033242d2895dfdf42de9261de94e15094fc35526834ab45b60c2f127e7f3
font_01_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10648 bytes
SHA-256: 1cf298806a17308d827dd97f83e86a5ccac0e46b5b3efd92e52a9ee6fd2716bb
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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