Malicious PDF — malware analysis report

Static analysis result for SHA-256 561d4359511f31ba…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 07:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 17ef4aa6a66f03a9a46131977fab029c SHA-1: 1e4f3f8bfb179e1188113f0eb9376d7df65e8a63 SHA-256: 561d4359511f31bafe57b99080a784cb8fac406309d77a3760b8b85a44724dff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=nurgle+setup+blood+bowl PDF link annotation
    • http://moxegelubopidi.sportsontheweb.net/takoboxidazadebiki.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/liwifenirotor_jelawagegalat_vuzugekuzijukef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_6015215d68399.pdfIn PDF document text
    • https://zigapugulila.weebly.com/uploads/1/3/0/7/130776078/bobaxujupeweg_bedeva_bewefopu_dudodanet.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/how_to_program_harmony_550_remote.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/00509f.pdfIn PDF document text
    • https://nixetamusizag.weebly.com/uploads/1/3/0/7/130740210/5142359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_603f3b4c85c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5fd1b5bf8c86a.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/number_theory_topics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fc6170900dec.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/sologimotosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_e23f70367328459485b8494deda7cb4c.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_533e49b03c314711bc37f4196297ac3f.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_1621abe9b03a4508914dfdb2e962971d.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_599a2db2b64b44bb9dfe8e6f48b203a2.pdf?index=trueIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_5243103b23984ef99563cb31d8f69713.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_8a1d68d744004dd4ac71d04fa832deb1.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_30651b670ba94e9f92684f71a380d57d.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_69739cb3ca12470db5647e3fddbf5163.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_1f49bae40d78452fac6a3c5856f55f01.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_88afdbbbf47a4e1da8beaa0731d97ef5.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_a6cdb2c619fd468098ea98f57c9fe9e6.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_d883a586622c4a5990f0fd872960b137.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_55da39302f3143c2aa33ccf0707584d1.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_e85c64acbac8435e8cd76dd1f2bd4e05.pdf?index=trueIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/the_secret_river_thornhill_quotes.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_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 5120 bytes
SHA-256: bfb3e59ca0b6e7e2c16637b6235d431b74f2031bdfceaadbf565c30289909334
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10496 bytes
SHA-256: 11786b8e04306b7c63ad562953c2137c1e22e82e41fba7ddd9bafe7a7f1b0fae

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