Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8fd3e41ed1b2c9…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 00:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3a4a7d1da93ef2c953bf9b47d6ca7f7d SHA-1: f38dcd9d34c52175fd7f034ab0ee0ea550ed6eb1 SHA-256: de8fd3e41ed1b2c96abfd1422a023f6e3ebb664d2825bc8aa3959b4eceb6abf6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=identifying+variables+worksheet+science PDF link annotation
    • https://cdn.sqhk.co/duvapegoleva/heZjhig/solarx_auto_insurance_salinas_ca.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/lepinawevezavivelezajuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_6038d400479c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_60108e827cbc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_604cdf1c32694.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/fAPheig/jorizejaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_6032fc3a3b5d1.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/jeijhd8/idle_home_makeover_mod_apk_an1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_600b6296ca893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_6004bf38a87ba.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/makalah_orchitis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451229/normal_601aac82e3cd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bisute/magitazosezewod.pdfIn PDF document text
    • http://mujunuge.rf.gd/adobe_reader_offline_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/defijelirijofolefazagumo.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/xosalomasatosovej.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/karate_gi_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/bootstrap_form_dropdown_placeholder.pdfIn PDF document text
    • http://bagabosafeko.epizy.com/dinolisewipotapivabovax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF01 5468 bytes
SHA-256: 20be40676d6cab73d8de20cfc8cf4599d972dd9473a2365519007830e040487e
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 4284 bytes
SHA-256: a97344d62c7c74388cd0a91d7641a031c9883599c1349837cefe784a6c4d0693
font_02_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 10672 bytes
SHA-256: 9f81ce7a751eea3fe591d17c6e47f539f704b2331924d465a5ece25acbc74a7f
font_03_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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