Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f7832705dd87a…

MALICIOUS

PDF

86.3 KB Created: 2021-03-07 15:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4daf47045f66d5b9d5b2fb412b2d2f0d SHA-1: 1e39224d1f0c6db628b6832ed5c439d1fa1ab6f8 SHA-256: 0a3f7832705dd87a0ea6d400a0fc43d917ada8b56f648240d923caa9e7e72a49
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it with high confidence. The primary attack pattern involves luring users to malicious sites via embedded links.

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://crophysi.ru/123?utm_term=a+canticle+for+leibowitz+kindle In PDF document text
    • http://fb-pageunderreview.com/behavioral_science_theoryhkamx.pdfIn PDF document text
    • http://piwudev.iblogger.org/fidic_construction_contract_template.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/vekuguxedisasege.pdfIn PDF document text
    • http://hellovendi.com/show_your_work_austin_kleoncdzoi.pdfIn PDF document text
    • http://yewes.fun/candlestick_chart_explainedn8pa7.pdfIn PDF document text
    • http://namelesssouth.xyz/81761388686tm5vm.pdfIn PDF document text
    • http://gunoxeririrof.iblogger.org/forex_price_action_scalping_free.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/i_hope_you_will_be_fine_meaning_in_urdu.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/10500629885.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/schwinn_270_recumbent_bike_console_manual.pdfIn PDF document text
    • http://kemotunitajifap.iblogger.org/putapajesumik.pdfIn PDF document text
    • http://my-favshope.online/manual_typewriter_jnl_font_free_downloadlf289.pdfIn PDF document text
    • http://beststudent.fun/netagosagukumaravinokarfynw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_ab213871204f4b5c930b3b9c4c83ed21.pdf?index=trueIn PDF document text
    • http://jatoxat.atwebpages.com/64454167994.pdfIn PDF document text
    • http://limizepafut.epizy.com/98750368836.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/el_coronel_no_tiene_quien_le_escriba_para_descargar.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_2be1cffb9e0a4cdf985805d0fce3a25d.pdf?index=trueIn PDF document text
    • http://faxiruvud.myartsonline.com/95089183209.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_c848a8ca5fc544dca0d348923d69f74d.pdf?index=trueIn 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_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 5172 bytes
SHA-256: c9b0f409c41297747d4761eab8e098af5c082c20cafb32c3671e9d2771d55561
font_01_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 11660 bytes
SHA-256: 0709055d134e3cb0293eb13841b30a4c92cd464311e74736b92272b98b3f6dda

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