Malicious PDF — malware analysis report

Static analysis result for SHA-256 f999e8836472c123…

MALICIOUS

PDF

108.4 KB Created: 2021-02-26 02:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e19b83ad337d47432aa92346598d36e6 SHA-1: 5c5a76dd2e0a145e81ce2d256b4c4a6d235e2f59 SHA-256: f999e8836472c1232ea45e213659e1154410b804040cc384199fe468864adcb2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a critical PDF_MALICIOUS_REDIRECTOR_LINK firing, indicating it directs users to known malicious infrastructure. The ML_NYX_PDF_MALICIOUS score of 0.999714 further supports its malicious nature. The document body appears to be corrupted or obfuscated, but the presence of malicious links is the primary indicator of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=peace+like+a+river+summary+chapter+4 In PDF document text
    • https://pisesiwez.weebly.com/uploads/1/3/1/4/131453260/jiwadisovowuxuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/chcNxie/17523800296.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/ayfjf7N/63651797684.pdfIn PDF document text
    • https://dorewedekubur.weebly.com/uploads/1/3/4/7/134721360/juzemavelosege-najexuremoxo-tuwigepolasuz.pdfIn PDF document text
    • http://tevfikyuce.xyz/endless_tower_guide_ragnarok_onlinezh1i9.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/bevuwuvi.pdfIn PDF document text
    • http://ipatovaalena.ru/extjs_tutorial_videojkpju.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://tejugezefufuli.rf.gd/busy_busy_song_320kbps.pdfIn PDF document text
    • http://bigepuvuxo.epizy.com/welelox.pdfIn PDF document text
    • http://dulubuli.rf.gd/59499312676.pdfIn PDF document text
    • http://kifemulawej.epizy.com/destiny_2_weapon_damage_spreadsheet.pdfIn PDF document text
    • http://midotujeg.rf.gd/chikku_bukku_hd_video_songs_free.pdfIn PDF document text
    • http://xevorerokune.epizy.com/certificate_templates_ppt_free.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_off0001609b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609B 5152 bytes
SHA-256: 398968251f7e41de78f2940b995e0721e9ee158f50c49bcdbc3ab65c97b13e66
font_01_sfnt_off00017232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17232 10648 bytes
SHA-256: 65e28bf08af23df9985502ed1ca450e11d9d156fa4b214328b733552f47b124a
font_02_sfnt_off00019663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19663 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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