Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a74968057aa2003…

MALICIOUS

PDF

72.6 KB Created: 2021-01-26 15:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3f117437079deb4be18115f31121c091 SHA-1: ce574b832bb92ca247b6c445d69462d776ad32ee SHA-256: 8a74968057aa200359d8f35f7eeae10198a3665ad58d28df49627b92d88c094d
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, many pointing to disposable hosting or redirector infrastructure, suggesting a link farm designed to distribute malicious content. One critical heuristic indicates a direct link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://gettraff.ru/wb?keyword=first%20aid%20kit%20supplies%20near%20me In PDF document text
    • https://vixojuderapu.weebly.com/uploads/1/3/2/3/132303060/zizerep.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/rebajege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_6008e06b641e8.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/1eb32e9fc7da.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/motugimoguwi.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/vewojamiterun.pdfIn PDF document text
    • https://xusopulude.weebly.com/uploads/1/3/1/0/131070786/6508211.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/network_cabling_guide.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/salopexogewomemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fe9916959ff7.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/zarevizebi/dls_profile._dat_argentina.pdfIn PDF document text
    • http://lekekavom.epizy.com/find_slope_of_each_line_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/64585990309.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5124 bytes
SHA-256: 53afed51610f07d19efc25f4efbe97474137b5a768ce5ea19afc8b7c7ab3e7a1
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 10652 bytes
SHA-256: 5f9bba034e47b0003d703ba5cb35f5333a83bcc7eacc3845410fd503cf7ec255

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