Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfa40bd978c04f6…

MALICIOUS

PDF

77.2 KB Created: 2021-02-18 07:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ead589095995c0582c99d842626cd699 SHA-1: 9e2f166243d70b537a5edde9581d0716902d459d SHA-256: ccfa40bd978c04f6e1efb7bf9e65ba463479905f726d2c2d5b437d33d1f74784
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://jottigo.ru/wix?keyword=algebra+1+eoc+practice+test+answers, are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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
  • 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.
  • 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://jottigo.ru/wix?keyword=algebra+1+eoc+practice+test+answers PDF link annotation
    • https://cdn.sqhk.co/tosuwukiwate/ie0iagf/94782500410.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/jddQjdS/buwafox.pdfIn PDF document text
    • http://osthondroz.com/bams_final_year_syllabusyddqt.pdfIn PDF document text
    • http://tebizutumitus.22web.org/food_guide_pyramid_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/KggDhie/piwag.pdfIn PDF document text
    • http://fimewot.xyz/6033236211157ch.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/ifYChga/color_chart_mixing_diagram.pdfIn PDF document text
    • http://basepati.22web.org/free_templates_powerpoint_history.pdfIn PDF document text
    • http://jegepev.22web.org/zavujanolulowebiribe.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/litunux/penyebaran_agama_hindu_budha_di_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/gipopiwewowulafidiziw.pdfIn PDF document text
    • http://tufubumokagefe.rf.gd/howl_s_moving_castle_violin_piano_sheet.pdfIn PDF document text
    • http://givaradipokez.epizy.com/sezoruroxuris.pdfIn PDF document text
    • http://mafofeguf.epizy.com/editor_de_audio_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/vipasejozemi.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_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 5376 bytes
SHA-256: 3e01096bb01428cf91cef1748df7b7792a18050f87464d3d76ec76b885ae5c89
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10916 bytes
SHA-256: 7e924b445b363a7b47d3ebac69864b858600017e3db29bca0c56fe8416f3fe6d

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