Malicious PDF — malware analysis report

Static analysis result for SHA-256 773f57fccc432a07…

MALICIOUS

PDF

78.0 KB Created: 2021-03-16 00:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0213f9edded606d2055f538dfa141681 SHA-1: c3f5abe693f1dc6b3f8305996a4fde669f413a66 SHA-256: 773f57fccc432a079b89d6a3c922e257367b73d4a346496626e19ff07711478e
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, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, 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
  • 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://vilenefex.ru/123?utm_term=namespace+for+crystal+report+viewer+in+c%2523 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449417/normal_600df98499082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_5fd78abaaab7b.pdfIn PDF document text
    • http://supunagoto.22web.org/gibubadafatud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5fcc29746b34a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_600d0fef468a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff0da38573f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_60178b823cb10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fc8de08cc907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_602f34d949e39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_6006d14736612.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/kelukakeb/tebelebisok.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/81888554372.pdfIn PDF document text
    • http://fonisojodivese.rf.gd/91870973386.pdfIn PDF document text
    • http://kajalefaruw.epizy.com/89974563735.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/proceso_de_administracin_de_medicamentos_por_va_intramuscular.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/64681814212.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/pafedixu.pdfIn PDF document text
    • http://riniwipum.rf.gd/systems_engineering_process_dau.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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 5384 bytes
SHA-256: 812d674547294527e1c5dba4a7c2f57bcda7d0123022cc71246a8c32c1b77919
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 18552 bytes
SHA-256: 8caa9ff9c1a18af384c19204ff10c8a4f58a44b71c30e64632e9982bed2cf761

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