Malicious PDF — malware analysis report

Static analysis result for SHA-256 00bccc60e6910351…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 01:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fb14ce836b22531ef0296191af10a9ff SHA-1: 72c8e100505d1e6c6ae4dac077f61037583c2e93 SHA-256: 00bccc60e691035167eb44f47dd912f403cdccb5c382aab5b9fd5e4a4499ad92
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/123?utm_term=online+video+er+facebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fe8d4df8d447.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/non_autoclaved_aerated_concrete.pdfIn PDF document text
    • http://pitushok.fun/7271519422554na3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_601814b96d4cf.pdfIn PDF document text
    • http://pixoros.iblogger.org/22569781821.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/ncert_exemplar_class_12_biology_book_download.pdfIn PDF document text
    • http://fresh-ita.fun/34454772832363c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6009cac3e9ca3.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/livro_de_genetica_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413718/normal_602d30d5151c7.pdfIn PDF document text
    • http://air-calm2.club/learn_spanish_english_translation_sentences491dw.pdfIn PDF document text
    • http://organize.shop/warrior_cats_movie_trailer_2019ig1hs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_60033d745e694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_602ee777241eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5fd2f88ce4b03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinojerazofot.rf.gd/como_convertir_pulgadas_a_milimetros_en_excel.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/awakening_the_third_eye_free_download.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_0b18c83432504ff586226873ec35ec3c.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_723f4ea0873c4de09d1fa3fc6e4fba43.pdf?index=trueIn PDF document text
    • http://tididesonorevo.rf.gd/6263505080.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/auxiliary_verb_download.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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5128 bytes
SHA-256: c2fdceb0d1701f114217e04417b1232bde6ef885182c04085b0b78ba46fa0895
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10864 bytes
SHA-256: 0ad5f39f1edb4ad4f4239c9bc5367ad03537ed6fd6d797521c6aee14f9eb4e17

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