Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b090d71f0a9268a…

MALICIOUS

PDF

164.0 KB Created: 2021-03-04 13:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e80c722b99ab3aefaf352d92e2199883 SHA-1: 898a33fe1bd2428cc1c86a8ca52d3d3602e19822 SHA-256: 2b090d71f0a9268a0b0baf010537b6931018fdaa3c8aed5d2b9f5921c3ef6423
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs, particularly the one on 'bologen.ru', are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=engineering+materials+and+processes+desk+reference+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409417/normal_602cfedd97902.pdfIn PDF document text
    • http://rawenspant.online/razer_blackwidow_keyboard_lights_not_workinguyywh.pdfIn PDF document text
    • http://instapriz.site/413957166271ylnt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5fe4067fef1bd.pdfIn PDF document text
    • http://kieverts.xyz/nifepetutowonasidubufogigugvcq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5fe823eb74784.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukanaxugosazed.rf.gd/mtodos_de_recoleccin_de_datos_definicin.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_031267a50a924d1ea8c8f8a5e0001e6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8d9a36-f688-4669-8607-3da4e4f1e775/jesagu.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_b5f6429ffc17401593b5e117405d9392.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_112f36fa646e472fb0530e9db3a6c3a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c60ce44-2dee-457c-ad4d-973b39bec3e9/boyce_elementary_differential_equations_and_boundary_value_problems_11th_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097772b0-cc78-4478-9594-08b1b2edf080/puvoguwinusal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8e1011-1ad5-4bbf-909d-5ad581878965/what_is_functional_job_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f0d3ee-4d76-43c2-91c0-e66fe0076b16/zetusudejunuvofev.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/73851123670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1caa2ea-714c-4a80-9c87-22bbce9f93eb/storm_front_decoys_12_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468e89b9-cafb-4ee9-9e42-49bcf6f26ef7/43842081620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eaf0606-c184-4cf7-ba58-4b762d10322d/briggs_and_stratton_725ex_190cc_air_filter.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_ff6f7e1dbfd74d4f8c92115c7ae27649.pdf?index=trueIn PDF document text
    • http://vugapadilubokis.epizy.com/jotigumadirave.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DD9 3388 bytes
SHA-256: 2d7d52d8c412d054d4f659c9a20b820cb41bcfe7053932e15877617ff7f19b6a
font_01_sfnt_off00021a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A8A 2872 bytes
SHA-256: ea18d12de3b231b305d916e97a9b3fe700a81a38429b6dccd25d7533a54d13f8
font_02_sfnt_off000224c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224C6 5496 bytes
SHA-256: e50c5558ef417b5e0c9a62ed5c19eee0d4f57e3a028586627c656e6b192d9203
font_03_sfnt_off0002376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2376D 13464 bytes
SHA-256: e43805b60d8028a8d322e5d0a94448ae803bce2b57861f9b6409d314686ecf41
font_04_sfnt_off000263eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x263EB 18192 bytes
SHA-256: 354e6406149a397ea23df6453a7c01620643d28141ace386638d62c59d6818ff

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