Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a7dc68d5e9a88d…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 20:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 166853536fd38f7f48eef8eec8e63e88 SHA-1: 393686d0948a25930c6a3571249b2af011cf76d2 SHA-256: c3a7dc68d5e9a88d045158b0f15ad9c3c76e4339baebca575a92408dc7a2cc6d
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable or unknown domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely used as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/award?keyword=metafisica+aristoteles+garcia+yebra+pdf PDF link annotation
    • http://nafarami.medianewsonline.com/what_would_be_an_examples_of_psychoanalytic_theory.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/2020_scag_tiger_cat_2_reviews.pdfIn PDF document text
    • http://business-open.online/principles_by_ray_dalio_amazon_indiay3ykk.pdfIn PDF document text
    • http://harkateine.fun/shooting_balls_3d_online_gamesugfei.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/best_place_to_read_marvel_comics_free.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/86730995124.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/17697072581.pdfIn PDF document text
    • http://matroskin.space/duvev5c5ri.pdfIn PDF document text
    • http://axecheat6.xyz/venn_diagram_questions_exampleb96yr.pdfIn PDF document text
    • http://legendarycraft.ru/the_deep_peter_benchleyblewt.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/21108527711.pdfIn PDF document text
    • http://devgame.design/kilut2y6zl.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/juduk/37853853140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07894f08-38c9-40bb-a4e3-53cb74a54412/26412600792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2932dcd-ec61-4ba7-8a90-052ddc5f597c/what_is_the_default_guest_password_for_most_linksys_routers.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/sedupegisowogabobeb.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/organizacion_interna_de_la_empresa_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/aver_vc520.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/pdf_to_word_converter_software_for_mac.pdfIn PDF document text
    • http://zijedan.atwebpages.com/richmond_essential_gas_water_heater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406bfd01-6405-4b97-b2e1-a81d08c571b4/14941072576.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/15380186480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bd90ab-3dc0-45c9-8e9e-5d8951c416b6/a_false_biblical_god_crossword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0228121-f4c7-44b4-897a-cc1831f35026/18706475986.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_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 5568 bytes
SHA-256: 493e11bd05a27857b38cab0e13ac1cdd177584ae98608ca49c66be29e69829b9
font_01_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 12424 bytes
SHA-256: 20069ab58fec1c764ae63600e36e1d00edeafffe450b92185cca8fc059fa0158

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