Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a2886e8a946b25…

MALICIOUS

PDF

78.4 KB Created: 2021-02-13 06:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 51c70a8095c46cfecb4895ca80a3f811 SHA-1: 44c31b0238bf2c23ac8099a67c3d34246a67fafa SHA-256: 41a2886e8a946b2536b8a1ab6e4e3bfd9933700d63aef4d6ec58c99bc5cb2133
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs, 'https://maypoin.ru/wix?keyword=los+cuatro+pilares+de+la+educacion+inicial', is likely used to redirect the user to a malicious site, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=los+cuatro+pilares+de+la+educacion+inicial PDF link annotation
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/jijelefimusaset_xaguvat.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/xapoludoviropi.pdfIn PDF document text
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/ganikiwozozibisedo.pdfIn PDF document text
    • http://azules.ru/2185873671168api.pdfIn PDF document text
    • http://websporizlehd.com/annual_report_design_word_template5heeq.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/c253a6.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/balanced_scorecard_dashboard_excel_template.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/dukoliduj.pdfIn PDF document text
    • http://begetus11ppz.xyz/sowuluzuvokek5z.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/ravuxudibure/colorado_secretary_of_state_form_llc.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/gazetka_kaufland_bydgoszcz.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/instagram_video_post.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/matching_3d_shapes_to_their_properties_worksheet.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_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 5008 bytes
SHA-256: 637c1add41ffabb82676dc6c12771a0bab28fc33804893865ec794433b43260f
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 11664 bytes
SHA-256: 6de23983ac99d3c8e137468c8de0508e691990b3ab2ea3b31d20caa2771bf7b4

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