Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b93fe15f65b238b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 05:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4a97ae15b884597faed3a708d4fd2a58 SHA-1: 33639ef441c1cc9e884d4360d0a9648905f9a0d0 SHA-256: 7b93fe15f65b238b0db07c51bbfba932fbb9526c0e93470598e5d4d8166aa154
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to reference product details, reinforcing the lure. The presence of external URIs and a link farm heuristic indicates the primary function is to redirect users to potentially harmful external content.

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://zajinet.ru/123?utm_term=ipod+mini+touch+speaker PDF link annotation
    • http://itslm.fun/bullying_causas_y_consecuenciasvp56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_603337dccdbee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_6034580fc2ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_5fe9f677b55e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fda4a3fe8bca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_6008b0245543b.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/bjbgejb/wawokufisunixesuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd63643836b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_60145bdb978f5.pdfIn PDF document text
    • http://cocobuka3.xyz/36057843692np0ik.pdfIn PDF document text
    • http://wspring.space/206132502549qedd.pdfIn PDF document text
    • http://ita-yog.space/5043468327080235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601c7b182662d.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/pagaxirusupuzazisulidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_60146f7eb6c12.pdfIn PDF document text
    • http://normaa-id.com/account_balance_prank_calllbo23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/sirunula.pdfIn PDF document text
    • http://tefozofikiduja.epizy.com/89832024462.pdfIn PDF document text
    • http://sugexure.rf.gd/que_es_la_adolescencia_segun_piaget.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5280 bytes
SHA-256: c5c4a3540c8f5705b10d7a10359be0627727c7ca17d45baa2d0b62be3f62cf1c
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10592 bytes
SHA-256: 129bb3db76df0c584dffae4f0692f3eec01e148f6bb8de27eedb9810312552d5

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