Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d0f32634b78b38…

MALICIOUS

PDF

84.1 KB Created: 2021-03-23 09:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3ccb89b4d14a8735ab693c3d752a9e2c SHA-1: b96313f4f3dcc952f257ea0d79c321eacc2109c0 SHA-256: 34d0f32634b78b38c8370eaf28eff9b20261e4f0665e94baece769452d9810eb
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/strik?utm_term=what+is+the+best+english+grammar+reference+book PDF link annotation
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/lukilalezugopot.pdfIn PDF document text
    • http://interior.estate/sizokdl2gu.pdfIn PDF document text
    • http://ingmijn.com/xezudavelesvipvi.pdfIn PDF document text
    • https://sofovelo.weebly.com/uploads/1/3/1/3/131379060/6df7597.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/8690663.pdfIn PDF document text
    • http://mebelintera.ru/lidevovurefimawikepajcs7cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_603e775d1c6ab.pdfIn PDF document text
    • https://jasixuruvixu.weebly.com/uploads/1/3/4/2/134234618/sotemupifumezal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_600d0aee6def8.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/c6b769fc1.pdfIn PDF document text
    • http://jodekemawa.22web.org/lekuniz.pdfIn PDF document text
    • http://dokovuxumev.22web.org/lugabujagiwuzinanozoxog.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://s3.amazonaws.com/xewamejixolefaj/zedozivasa.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/burgener_warm_up.pdfIn PDF document text
    • http://vobazajeg.rf.gd/podagukavabaxufaro.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_bccd59cd187c450ab481c4a01630830d.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_edd7177e1b03428680995727ec033392.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/cessna_172_skyhawk_checklist.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_3be10a5e58c44a1c9fcb25abfbf7920c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/what_is_the_molecular_geometry_of_cli5_c_l_i_5.pdfIn PDF document text
    • http://sasududazo.epizy.com/amrita_nayak_latest_odia_song.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_da050e74b59b47baa56df27a65415aa7.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_d4e525f10423409699831574bf5d9bc4.pdf?index=trueIn PDF document text
    • http://malosebetu.epizy.com/telegram_x_for_pc.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_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 5300 bytes
SHA-256: c461a604f3cfb3d8840f5b7fb1192c77d0c7bae01ea7b28bea164797ef8fbcdb
font_01_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 11120 bytes
SHA-256: 879891ecb2aa9f8c572bc52ca316e2e782f3558ad50a37d6c80b97c1490a9c37
font_02_sfnt_off00013480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13480 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361