Malicious PDF — malware analysis report

Static analysis result for SHA-256 507019bd7f2ff662…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 16:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe4ef5eae7ff7142efa5d11173ee323 SHA-1: 1dc2f558558ac3f81151b5987fa6bcf5b4c0e7a5 SHA-256: 507019bd7f2ff6626ec067afd99211ec6eee9a8bc1aae97ce79c85b2f2dd33cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link leading to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=critical+thinking+assessment+test+free
    • http://mitedujonajezed.scienceontheweb.net/24438158506.pdf
    • http://newuwedeza.mypressonline.com/sepuja.pdf
    • http://wunuvuzixuxi.getenjoyment.net/encyclopedia_britannica_volume_1.pdf
    • http://gatorama.space/how_to_become_chick_fil_a_franchise4066h.pdf
    • http://vawabipoxe.sportsontheweb.net/buwatu.pdf
    • http://roxelejabojafe.scienceontheweb.net/zuxiwijopaboguv.pdf
    • http://nesobaka3.xyz/is_the_wings_of_fire_tv_show_going_to_be_on_netflixo4l9o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rumezo/nescafe_dolce_gusto_manual_machine_instructions.pdf
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_8ffaf582f13744758391566c32de80a8.pdf?index=true
    • https://s3.amazonaws.com/ropidadegaxut/verajujilitegosekole.pdf
    • http://kedisijusa.onlinewebshop.net/97820795191.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_9088df74d4924394bad97ce73e8a46c1.pdf?index=true
    • https://s3.amazonaws.com/duzexefemosaxe/77130063133.pdf
    • https://s3.amazonaws.com/tuxutedi/wodunuwofizigutibok.pdf
    • https://s3.amazonaws.com/widofafane/old_spice_company_history.pdf
    • https://s3.amazonaws.com/fajujiju/dinosaur_4d_cards_free.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_00678094ead34a24b8915ce6233bef8a.pdf?index=true
    • https://s3.amazonaws.com/rizijubovapuk/lagu_akra_lai_lai_remix.pdf
    • http://zuputes.atwebpages.com/is_ghost_recon_breakpoint_beta_cross_platform.pdf
    • https://s3.amazonaws.com/nisiwanolom/alesis_qs8_keyboard_review.pdf
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_a8d9ceb27cef4334a3119a405bfe5600.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede7.bin
bbf1e613d5866bc0b637ebd104e528607f49bc750924c3307cad1255191c98fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 5264 bytes
font_01_sfnt_off0000ffa0.bin
d25f288e03de038fb7bdcdb8c19afa50c0bf623c6b3e34c2b22cea7bf7615cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 11740 bytes

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