Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b16b435c2c3b5b0…

MALICIOUS

PDF

81.8 KB Created: 2021-05-02 15:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ba3e4e6d98a4b6d7c5066a58a3f085bc SHA-1: af6a98a74d42aa3d6de528e3c00866f6e85fb6cb SHA-256: 2b16b435c2c3b5b00da8556f29b6775dd067145e0bff8b283959fd36c395fd5c
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

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://ponafet.ru/strik?utm_term=the+fallen+skyrim+can%2527t+call+dragon PDF link annotation
    • https://cdn.sqhk.co/gevajoke/ijiyhaW/photo_editor_pro_apple.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/ratewuzu-rafonupadodezob.pdfIn PDF document text
    • http://tohld.in/hangman_fracture_classification_radiologyq4grz.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/shcihaS/mojesizagixazexali.pdfIn PDF document text
    • http://study-english-02.space/introduction_to_embedded_systems_a_cyber-physical_systems_approach_solution_manuald52dx.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/ihf98be/children_s_beds_for_sale_on_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/VOSjhjh/89411064133.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/jciagf1/jilobirok.pdfIn PDF document text
    • http://dommasters.site/98021048197keu94.pdfIn PDF document text
    • http://gratoraama.website/trending_videos_best_pimple_pop_ever0zol8.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/lirexaxudeso.pdfIn PDF document text
    • http://zzzmmmmejjj.space/87475466798mdvo8.pdfIn PDF document text
    • http://fartook.online/letunaxirakok9ohrh.pdfIn PDF document text
    • http://damvglaz0.xyz/34519842572onelh.pdfIn PDF document text
    • http://studyweb.site/platero_y_yo_resumen_corto_por_capitulosm5rdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_33b8fa41381e40cfbae89e2aa4c89fb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c096d39f-6c95-4442-b738-7ca75f53f44d/98012521465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b2b26e-1d80-4866-99a9-88c3182ca86c/7908479258.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_e031e6cfdec74da89893f2d5b58fb8b7.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_c53db7871ea84ca9b9aaa8d18fff03e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/041737f6-edb3-4236-807d-dbe9b02df0b2/15565719210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a501419-2da9-4e24-bc29-fe4d6a86cbb8/medieval_2_total_war_stainless_steel_6.0_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_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 5584 bytes
SHA-256: 004608b3196ae549f58bb564dcf65bdbefe124e8959a067416e2a06c395edcef
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 10772 bytes
SHA-256: 506673fd30feb27b7a8762bf4edfd1a89237109cf2178a67a4eb82c82fa35a78

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