Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cae0fbe0075ab6…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 10:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d35aaac3a339ac582fea27a583a1aba6 SHA-1: be6880572bb37c6157d0a84c4dfc5d6ca522fb19 SHA-256: 37cae0fbe0075ab61795b3c6687210c59f0e9db5a52ba3324dfbfa595f1c417b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are generated SEO-style, suggesting a link farm or a method to disguise malicious content. The primary URL, 'https://seumenha.ru/award?keyword=the+warded+man+pdf+download', indicates a lure to download a PDF. ClamAV and ML classifiers strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=the+warded+man+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468838/normal_6047978907861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60620a6487960.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/business_model_canvas_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_600fb052e245b.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/rufonali/92838624314.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/92489275933.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/statistical_analysis_in_excel_2020.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_c93908bb449c49fc8129f4145fc8b3a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/gogubufopogoxowepaf.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/what_does_the_expression_tee_off_mean.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_d24e4649517546b4bbe1fcf363665f0d.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/945699228.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/file_annual_report_for_llc_in_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/61595905393.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/cafe_racer_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/lg_ductless_air_conditioner_remote_control_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/taretux.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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 5144 bytes
SHA-256: 86f3b256b4d07418a536f997aae4864eebc72a2140c82da76c472382325d6e7c
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10368 bytes
SHA-256: 2fea346d6d9bd1a5081d7ebb9d6193913e3fdfa3c65239266caca99c16ec8ede

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