Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc8723e155b0608…

MALICIOUS

PDF

67.6 KB Created: 2021-02-23 22:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5eaae277762bb5c007d11d01ad6831b9 SHA-1: c7a65498ccefb6a114b91773220226d4e6fea9b9 SHA-256: 4dc8723e155b06081322ad313d8917e3bd5f163d2bedd688c54c9f25e5f56298
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the identified malicious URL.

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
  • 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=kenmore+elite+over+the+range+microwave+black In PDF document text
    • http://hotita.space/608166296557n5g1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_600a7a0e744bf.pdfIn PDF document text
    • http://genoray.pro/4888731720620ugb.pdfIn PDF document text
    • http://usesol.xyz/como_cerrar_manualmente_el_quemacocosnh28u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fed68d20ad9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_60180f4d09f01.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/rizezobabub/watotolukivevulijudo.pdfIn PDF document text
    • http://meludakezadew.epizy.com/black_and_decker_battery_charger_manual_bc15bd.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/zelutodidapodutuxovudi.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/body_planes_and_anatomical_directions_worksheet_answer.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/carte_de_paris_arrondissement.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/27086819386.pdfIn PDF document text
    • http://zabirozoxut.epizy.com/bio_data_format_in_word_for_marriage.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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 5360 bytes
SHA-256: 0191af6e23c533751ee12f1621264b60e12b29f6046865686a13cb68542c37ec
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 11216 bytes
SHA-256: 3869b3f77d6bee6eb8a73d586e22c32242788ee5f7ff2c3ce46233ee7b0c3e0d

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