Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafe693596f2143a…

MALICIOUS

PDF

74.1 KB Created: 2021-02-20 12:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0e4838b07746fe897f264d56cab916b2 SHA-1: 0bf3973d008b1b1b15905fc61a3aadd73ba1bbce SHA-256: dafe693596f2143adf50c76a1894c006e4782a946dded3bf0ef53c818654b9f8
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of these malicious links suggests an attempt to redirect the user to a phishing or malware distribution site, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=how+to+know+if+baby+has+developmental+delay In PDF document text
    • https://cdn.sqhk.co/fobonelaga/DhdJdja/resident_evil_8_launch_date.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/ggdR87o/leguwofuriru.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/bhfEjbr/watch_birdy_the_mighty_decode_english_dub.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/2880035.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/icwYPYk/nupujipu.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/eAhes9v/judawoxafatavewesesisogo.pdfIn PDF document text
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/86aa4.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/xufaxoferugod/2_step_equations_worksheet_7th_grade.pdfIn PDF document text
    • http://xatonerux.epizy.com/genotype_and_phenotype_worksheet_answer_key.pdfIn PDF document text
    • http://wiwafejopof.epizy.com/free_executive_summary_example_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/hypophosphatemic_rickets_treatment_guidelines.pdfIn PDF document text
    • http://tutivute.epizy.com/idh_angola.pdfIn PDF document text
    • http://zefupolegemawak.rf.gd/fixefojalav.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/sotexowuvusonimu.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/exponential_form_to_rectangular_form_calculator.pdfIn PDF document text
    • http://werapitagu.rf.gd/como_cerrar_sesion_en_messenger_lite_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/64640585478.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/shapes_worksheets_for_toddlers.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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 5604 bytes
SHA-256: e61c45910b80a5364cd43dcf2baa7d2291c2daac29c2d024055a73bd323bfa24
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10212 bytes
SHA-256: 3d3000fcb12fbe6a4ab232468e33f530a03e5eca3390544e857e40eef82fa79b

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