Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d83d652c24ceff4…

MALICIOUS

PDF

65.0 KB Created: 2021-02-07 22:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c3ef1b5a481ca6e50a92c88f4c533928 SHA-1: 5af3b38a063277f68d7349d05f0943ca7c4de22f SHA-256: 3d83d652c24ceff49bbe9f5afbcda36c20fda67dc5dce6e6b2113b3417c01683
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/aws?utm_term=coffeyville+livestock+market+report PDF link annotation
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/wuwuxezoze_wexem.pdfIn PDF document text
    • http://tujozavido.66ghz.com/expenses_by_vendor_detail_report_quickbooks_desktop.pdfIn PDF document text
    • http://zusazibob.iblogger.org/aha_acc_hypertension_guidelines_2019.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/taxogerej.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/996ccfb2c4efe1e.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/GifsR2y/visasetiruxeleruwilaxod.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/hcOhIhb/superhero_run_2019_near_me.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/fejakixoweka/93160150761.pdfIn PDF document text
    • http://nejovafejasujob.rf.gd/espen_guidelines_for_enteral_and_parenteral_nutrition.pdfIn PDF document text
    • http://mimonutemabase.epizy.com/logolu.pdfIn PDF document text
    • http://torumaxot.rf.gd/formal_approvals_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/xezijo.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/catalogo_mary_kay_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/ergotamine_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/maclane_category_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/rivemepunopabu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/answer_buzzers_in_store_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/39903394218.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/personal_loan_promissory_note_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/5048594066.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/satenolisupemuzefazo.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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 5292 bytes
SHA-256: b09af3c9afce702bfed6fc3e9d642fa274f2532df9e1a02833ae1f74460714cd
font_01_sfnt_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 10232 bytes
SHA-256: 1e0bcf5eb08a99dbc8a57c26eddee5b914f03db50a442c8aa0483000fd0e620d

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