Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bbe16fafc50de2…

MALICIOUS

PDF

69.8 KB Created: 2021-04-02 13:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43cc18b37f82f469ed4b8b84d022ae94 SHA-1: 4e59f570cd610aa4254b01576d5d048d5c766dd8 SHA-256: 72bbe16fafc50de25fe27e45fe869cbd4227ff7647803a80fb8fedd67993574a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to SEO-optimized PDF documents, and a specific redirector URL: https://dugedepot.ru/strik?utm_term=what+is+thirty-one. The presence of these elements strongly suggests a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=what+is+thirty-one PDF link annotation
    • http://jewofuvivonog.getenjoyment.net/career_path_worksheet.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/ed956f86.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/2020_milwaukee_brewers_schedule.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/acids_bases_and_buffers.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/7f1f8d0d2169d2.pdfIn PDF document text
    • https://wumikedamuzu.weebly.com/uploads/1/3/4/3/134324885/e6ef478833.pdfIn PDF document text
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/mezorupazeripagupol.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/wunojipu/mafeloko.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/83765184737.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_9857dd63b77a44dfb0e4f32df3aa092c.pdf?index=trueIn PDF document text
    • http://dowupozor.epizy.com/yale_mba_employment_report.pdfIn PDF document text
    • http://rolawitakomot.rf.gd/rojapo.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_5938e368de724ca4b8d821c9221b2cbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudurat/suara_burung_merpati_hitam_sulawesi.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_f4364d2a09ae4b5b8b42fc2f76e49a21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vosimalume/wibexun.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/revolinatopejizaverajube.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/togubipupepi.pdfIn PDF document text
    • http://zugotival.epizy.com/12946701319.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_7b01b75c2cf44902937b7fa64e6fdce0.pdf?index=trueIn 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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 4888 bytes
SHA-256: e1020a0a221f393981aa27676bda3dcee1a69308cd8417e657431c577533a6a1
font_01_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 10868 bytes
SHA-256: 43e2bbdd9640e652cec0f4b138f6432c8707a55e3327edf699faa846953c70d2

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