Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc5254be2e0c535…

MALICIOUS

PDF

78.0 KB Created: 2021-05-11 22:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a159adf81b0a9a383a4525163613dfd6 SHA-1: b8c2b810148738af7ac7f80c24285819e64687b7 SHA-256: 6cc5254be2e0c5354ba94f0628dab4f92665ac517a2160483660969bbed7f18d
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a potential lure pointing to 'kuzutuzo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to obscure the true destination or evade detection. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=unit+circle+problems+worksheet+pdf PDF link annotation
    • http://marafonsport.site/best_police_siren_app_iosgei81.pdfIn PDF document text
    • http://abistrans.ru/36137670448ujamr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fed903337b99.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/fa05098a.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/830c0c5b41ed8.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/881277.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/xuwototikaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5fedf4c152a4a.pdfIn PDF document text
    • https://gusovegexu.weebly.com/uploads/1/3/1/4/131453321/zetoguz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390643/normal_5fc9dc5ecb6bf.pdfIn PDF document text
    • http://weex.info/93354204072tvkr9.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/baxekojojexusol/80823490932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ccdbfb-a6a3-47a9-b9b2-c5cbe167a398/vulinikilakumimuxotali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8771531f-d2be-4c61-9ead-8fd69fb3cb82/68667072192.pdfIn PDF document text
    • http://rurebirafana.epizy.com/97074872338.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/writing_papers_in_the_biological_sciences_5th_edition_free.pdfIn PDF document text
    • http://xesenewuro.rf.gd/laporan_pendahuluan_subarachnoid_hemorrhage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614f0f3b-fbb7-4694-9d93-16edde31a188/zesasolaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553dbc4e-deb1-4c70-92c4-7eda225e71f1/21849334768.pdfIn PDF document text
    • http://dilerotarepisa.rf.gd/21880530832.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/muzatarosasovogabalam.pdfIn PDF document text
    • http://nidudovuj.epizy.com/gcam_camera_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cdafc5-0f12-4dfd-b90a-66f558bd8965/texivegovejujovebuwupib.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/wawomulad.pdfIn PDF document text
    • http://xizukej.rf.gd/orpheus_and_eurydice_main_theme.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 5472 bytes
SHA-256: 4a2f27e4c78ed97612ef6761c4342c44c029040ee0d2c7954b73910287038886
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 11024 bytes
SHA-256: 3c804e60f0e1c3b9c684f46fd648238df6d9bcbe5d9555fdfea2013be8178750

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