Malicious PDF — malware analysis report

Static analysis result for SHA-256 572ebb8a1f545ff7…

MALICIOUS

PDF

73.5 KB Created: 2021-03-16 00:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f43076e337a017df9ed02764a74f4c05 SHA-1: 57e0f749871dd3bca4d063243f82774eb27d45cc SHA-256: 572ebb8a1f545ff71b6e6cc6170cdeff474a678dc391ff46c7aa02df2ec63b7d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a high concentration on disposable hosting, and specifically directs to a URL that appears to be part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=which+night+vision+scope+is+best PDF link annotation
    • http://milafikolume.iblogger.org/bapesupigibukixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_6013860026e06.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/kipalumowal-gexexobu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5fe08bb411c5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fddd0c90151b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456389/normal_6004eec474d87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_5ffea8bd8c403.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/jeremy_bentham_philosophy.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/fanibiwot.pdfIn PDF document text
    • http://laguduzimunek.22web.org/53969008750.pdfIn PDF document text
    • http://tokibekojavo.22web.org/aromatherapy_essential_oils_chart.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/jfk_inaugural_address_rhetorical_analysis.pdfIn PDF document text
    • http://viriruxik.22web.org/zijukapigeki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujebik.atwebpages.com/buddhism_for_beginners_by_thubten_chodron.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_cefb9bf7e1f3473ca1611171813c2804.pdf?index=trueIn PDF document text
    • http://nogibusap.epizy.com/bodyweight_back_exercises_to_do_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/66316718819.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/printable_emotion_faces_for_preschool.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_6b561c15e9764509b6f436bc1d69f6b8.pdf?index=trueIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/what_is_the_difference_between_honda_eu3000i_and_eu3000is.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/vubefusajobirurex.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_9176bf07f54b46dcbd18d5e911011a94.pdf?index=trueIn 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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5068 bytes
SHA-256: 31605fa550511b4011d815c73f16d49fd485600c9b3d3835328456a8d24835e7
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10504 bytes
SHA-256: ff1555b011e452dee0be1d2bbd25d601f29d5c816d68ed133b9f03a697979609

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