Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd72eeb4e13a5d6…

MALICIOUS

PDF

72.5 KB Created: 2021-06-01 17:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 01c9d6d1da85ed9268461bbafc14aaf4 SHA-1: e492ad7b591428006079f4bad21c33af719345b1 SHA-256: cdd72eeb4e13a5d60b3e9a9d7b77d3be1b2f754f3a5821f5df9acafb70fc503c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs, including one pointing to 'drafthe.ru', suggesting it's designed to redirect users to potentially harmful websites. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://drafthe.ru/pbw?utm_term=is+300+in+the+3+times+table PDF link annotation
    • https://wisukemebo.weebly.com/uploads/1/3/5/9/135962546/a9ccb.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/cc6699ed23.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366642/normal_60b240db1cb6f.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/jiliruriwotoma-bifirumif-nituwakex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_6065572116246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5fe4e6c225ded.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/1f215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_600ea186e2c4f.pdfIn PDF document text
    • https://xedafiwiwez.weebly.com/uploads/1/3/2/3/132302754/1579178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd1a9b79ec23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_604a696766321.pdfIn PDF document text
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/8318146.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443341/normal_60b36390d8874.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/0cc0a7fa-9e2c-4d8b-8c08-a5dca1580783/what_is_the_spiritual_significance_of_the_number_1117.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144441699/12985038882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d1fd31-1b94-40d6-b520-f47d0a1c280d/gisaditazurefipavafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fd9e9e-6112-4770-aeda-0738692fd010/how_to_print_htv_vinyl.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144468108/my_talking_tom_2_mod_apk_mediafre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac866bd1-acd6-4302-9ec6-68a9c71ca3f9/12101437298.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144458505/how_to_hack_in_counter_blox_2020.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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 5212 bytes
SHA-256: 20394844a8ba32aab7564e6976977f8ffaf202b4ea4242e8c9054a3c33725e47
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 10232 bytes
SHA-256: 8cf0c35f6833cadc6bc0151429d3d60bd418615c2f4f82a5aa2c6641c1cb0a21

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