Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91f4fa002e96ca0…

MALICIOUS

PDF

72.6 KB Created: 2021-02-09 21:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6bb454c962678c7cc3c6f46c49579381 SHA-1: 47fd62d00e9615dc392333c97a9103405c33bbf4 SHA-256: d91f4fa002e96ca0cd0ec1afaebefcfd43c500def210d58f083fe6c0cc02809e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://druttle.ru/aws?utm_term=esl+first+day+of+class+worksheets+pdf PDF link annotation
    • http://nagajavanof.22web.org/spring_coloring_sheets_for_preschoolers.pdfIn PDF document text
    • http://gonzo-3d.com/charmglow_patio_heater_parts_thermocouplexott5.pdfIn PDF document text
    • http://closemaze.com/mozart_bassoon_concertosvmt2.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/jihadsquad_osrs_spreadsheet.pdfIn PDF document text
    • http://djami.ru/dixiferorejewumetuq4mal.pdfIn PDF document text
    • http://instapriz.website/foobar2020_android_media_serverxdrjp.pdfIn PDF document text
    • http://13millions-warzone.store/rituboxurisasol90ra7.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/eidiaZ4/asphalt_street_storm_racing_mod_apk_an1.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/Jhhjihb/vikivosilivigonabipugofu.pdfIn PDF document text
    • http://orbitan.fun/venorowilokatimupk3.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/eheC9ih/logopuwu.pdfIn PDF document text
    • http://wepovak.iblogger.org/jinifofumanesaravamadeji.pdfIn PDF document text
    • http://shopmzm.site/banonopezipezefafapesugutecqw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nidudovuj.epizy.com/alif_drama_novel.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/redefesadokidokex.pdfIn PDF document text
    • http://kulixuvomewono.epizy.com/teamviewer_12_for_windows_10.pdfIn PDF document text
    • http://lakuxizutigevo.rf.gd/javezulidikasuwuvaveg.pdfIn PDF document text
    • http://tetexabe.epizy.com/bandung_indonesia_shopping_guide.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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 5460 bytes
SHA-256: bedb7bac0729c6c64c8eac6b5ebbd3ba67266063446c96c3a6f93c4332ae9e70
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 10384 bytes
SHA-256: 2da524ce725feeea583b06edd21413dbe5c755e471da45ca9e50ed71c71bd53b

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