Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e7b9568b3e516c…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 17:33:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d22522e06bf037c5397e1c58625307f7 SHA-1: f0733e32df37bc7837fe65f196b216783094c54b SHA-256: f4e7b9568b3e516c6aa2b2a4f1484678a6d6b41ff0af7e45d7e994078d2ac378
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the document with high confidence. The presence of these malicious links suggests the document is designed to redirect users to harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=resumen+de+carta+a+garcia+pdf In PDF document text
    • http://springwin.space/36728073579hu148.pdfIn PDF document text
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/8989181.pdfIn PDF document text
    • https://cdn.sqhk.co/diruzatojep/pZifTCt/38402010945.pdfIn PDF document text
    • http://sberbank.services/fexamoweqy4yv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_6008b4268cd74.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/ifxhajj/santorini_greek_cuisine_deland_fl.pdfIn PDF document text
    • http://vzale.ru/55271013903khm7.pdfIn PDF document text
    • http://mowewuwopirot.iblogger.org/noun_phrase_worksheet_for_grade_9.pdfIn PDF document text
    • http://cozyplacefor.rest/rmlau_result_with_marksheet_2015xgukg.pdfIn PDF document text
    • https://cdn.sqhk.co/lixepupo/5giEKyD/myrkur_mareridt_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419192/normal_5ffc92519e249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_5fe6728786dd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxumokuri.epizy.com/ada_standards_for_accessible_design.pdfIn PDF document text
    • http://rotanejepajedef.rf.gd/41003204638.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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5448 bytes
SHA-256: 8c477d21e581bf0797e7b7d8cc1a4903d1fbfcc1b4dc8bbb9ca3e38dfc43db7c
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 11440 bytes
SHA-256: 893b6b8f25c9aabbe2e9f43afa138730ac436b15b4faf91400fe123e2d0e684d

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