Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08e8de79ed003a7…

MALICIOUS

PDF

67.9 KB Created: 2020-12-17 19:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cc596a422653d5b7ba958c29bdd7d36d SHA-1: 08292244bf2d92f4c4cbca5a9d585f82aca8e1d0 SHA-256: f08e8de79ed003a7457f46b873068c986bf929bfc3c4b08ca4f35ece0efd00d2
244 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 a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting and a known malicious redirector, suggesting a link farm or phishing campaign. The ClamAV detection further supports its malicious classification.

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://traffine.ru/123?utm_term=furnace+gas+valve In PDF document text
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/01a90bdc20.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/rovigogo_novuba.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/5488b.pdfIn PDF document text
    • https://julufima.weebly.com/uploads/1/3/4/8/134884845/giziwakobararerizawu.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/2634617.pdfIn PDF document text
    • https://mojeleku.weebly.com/uploads/1/3/4/8/134862936/seporojibodutilujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af697d4d-bb3b-435f-86d9-40b875e1d221/72992646473.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/circulatory_system_diagram_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaf82a5-6912-4d6b-8c75-1c760c521184/naoki_higashida_the_reason_i_jump.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c82527a199023ab4b7a9/t/5fcee070ba7003536e9bcd90/1607393395522/temple_run_3d_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0bd810-bb44-4302-bef9-f7d7781e529a/narimide.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_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 4980 bytes
SHA-256: dcc1536391f90f83172c9ec945166bbbf969ed93ce9be9de16dd88d08701fd0f
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 10140 bytes
SHA-256: 77ecb1804bf0cf72bfa852be751699693a8aaead57cbc781822c52dd61bbdd8e

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