Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28c391f77180d7b…

MALICIOUS

PDF

78.6 KB Created: 2021-02-22 00:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a36527ea01f6a509215e42dad60e043e SHA-1: a2220b4f98c2e157f20cc2f73170aa2a68712c12 SHA-256: f28c391f77180d7bafe216ef8cc7271270dcb8ddc32620860cc1de488b3c064b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=irulu+expro+x1+plus+tablet In PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/16b4a8fa1.pdfIn PDF document text
    • http://fevalugumaj.22web.org/how_to_do_code_freeze_dryers_work.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/7321774.pdfIn PDF document text
    • https://tavugalijob.weebly.com/uploads/1/3/1/1/131164394/xotavuz.pdfIn PDF document text
    • http://skywonder.space/939890360596jqyi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416305/normal_601d1dc42df34.pdfIn PDF document text
    • http://wofoweniwer.iblogger.org/bezuxebu.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/325f9717677.pdfIn PDF document text
    • http://nuvotana.22web.org/california_rules_of_court_citations.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
    • http://tufosugobevoni.rf.gd/how_do_i_contact_dunkin_donuts_corporate_office.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/the_vietnam_war_protest_music_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/lotigoxivupaditi.pdfIn PDF document text
    • http://jipowefata.epizy.com/dhs_authorized_representative_form_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/zanilezejajejosasem.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/after_effect_presentation_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/folder_dividers_template.pdfIn PDF document text
    • http://lepefefila.epizy.com/77252324658.pdfIn PDF document text
    • http://ruwiluleter.epizy.com/non_coliform_organisms.pdfIn PDF document text
    • http://vegobojogaroju.rf.gd/nafta_certificate_of_origin_form.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_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 4736 bytes
SHA-256: 556cda4c6f050dcc57e562a2fde1f93ba661472d45b3f92da94d3d174320afe1
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 10532 bytes
SHA-256: d67fe89fd39221d4ef318ab9e192ec73233353e9c71cca288acee302d24a8953
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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