Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7f1cf3ab884e6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 14:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01bbc97ef1eb384c4385e62dd4bfacfd SHA-1: b1cde399cb2bedfef013aa48df1d322da1132737 SHA-256: 19b7f1cf3ab884e6c95ad4c500217ce945b9774809ea978ad647ed0f99a58377
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, including one pointing to 'midufefew.ru' which is associated with a keyword search, suggesting a phishing lure. Another URL, 'salleapp.xyz', is identified as a link farm on disposable hosting, further indicating malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=uncharted+the+lost+legacy+treasure+guide PDF link annotation
    • http://salleapp.xyz/105376775805yj1s.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/8hhd0if/movafemejubakidezagimo.pdfIn PDF document text
    • http://optamorem.com/woxowadn0qys.pdfIn PDF document text
    • http://exampl1214.com/63886978145a6ir0.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/tivudivufenip.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/e3dd0.pdfIn PDF document text
    • https://zovamegazojuji.weebly.com/uploads/1/3/4/8/134849063/kemufowagigiseke.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/BZ1Psjj/72784087651.pdfIn PDF document text
    • http://nateribebomulaz.medianewsonline.com/curso_frances_completo.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/aulas_de_espanhol_para_iniciantes_em.pdfIn PDF document text
    • http://mamuxorap.getenjoyment.net/sunorimigiviragunojem.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/gafajisa.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/zozofufulolig/72406035586.pdfIn PDF document text
    • http://vakifavu.onlinewebshop.net/sahih_bukhari_arabic_and_english.pdfIn PDF document text
    • http://pezamax.myartsonline.com/9086215025.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/breaking_dawn_book_2.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/juwoxama.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/panduan_belajar_tajwid.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/graphs_of_sine_and_cosine_functions.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_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 5292 bytes
SHA-256: be142673394d61a67793bfa10675747ea71815abbc49a862fc884ab9ec35a289
font_01_sfnt_off00011766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 10348 bytes
SHA-256: e9fc9c518f89b5495fdafbe7fb3c998937503eb1264bc5c1afe7e64a89b6ca11

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