Malicious PDF — malware analysis report

Static analysis result for SHA-256 518d0441479a59e6…

MALICIOUS

PDF

97.1 KB Created: 2021-04-02 11:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a16b4f3f57111c099eb78f07f7e17d37 SHA-1: cdf3281562fdcaca0dd97e8843b5838e66f4a5f4 SHA-256: 518d0441479a59e63059f41d881753c012d16cc3be0164ec1885533a2c98ccc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, with heuristics identifying it as a link farm on disposable hosting. The primary function appears to be redirecting users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seumenha.ru/award?keyword=nelson+mandela+biography+book+pdf PDF link annotation
    • http://kittyplay.online/vowutenefadinugibajeiq3.pdfIn PDF document text
    • http://d-youtube.com/356967345097v56h.pdfIn PDF document text
    • http://funseeds.site/32953511353i8bq.pdfIn PDF document text
    • http://vafutixon.22web.org/accords_piano_position_doigts.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/YLiyjct/82495639683.pdfIn PDF document text
    • http://ttop-shop.com/free_family_tree_template_excel_with_siblingskjlmk.pdfIn PDF document text
    • http://springwin.space/kulolavufatajido0vgl6.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/Negedme/fun_words_that_begin_with_w.pdfIn PDF document text
    • http://nature-ital.space/los_axiomas_de_zurich_completo2nb66.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/0ErmhcV/2803330766.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/vjifSuU/behaviorismo_radical_livro.pdfIn PDF document text
    • http://esagafow.fun/netflix_laptop_windows_7tsv7h.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/gfh00oo/music_events_and_festivals_2019_california.pdfIn PDF document text
    • http://hihikane.space/bam_bam_bhole_new_dj_songgnipu.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/bridge_builder_funds_annual_reportig0jn.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/lunidit.pdfIn PDF document text
    • http://senteber.site/explain_arithmetic_mean_median_and_mode_with_examplesqjtld.pdfIn PDF document text
    • http://sivesesugipode.scienceontheweb.net/nuzor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_8e8422a97d4349e8911658b17dd9b99e.pdf?index=trueIn PDF document text
    • http://nuxumejaxumem.epizy.com/12386779026.pdfIn PDF document text
    • http://varozeradak.epizy.com/womiju.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_4dced2af9554409f9795e974ad194b26.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_52ef34286abb4a9b85d82d1f07a50e5c.pdf?index=trueIn PDF document text
    • http://selomuxoper.epizy.com/why_did_the_soldier_settlement_scheme_fail.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_27ea7ad6e34b4ddcb00d0e0a4c1676d1.pdf?index=trueIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/88182467958.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_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 5728 bytes
SHA-256: b9bc6442caa9c66205b77ef929b336c3d2e304bd49ed4c9eabc63a7c750c15f0
font_01_sfnt_off00015041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15041 11424 bytes
SHA-256: e732e4469e264f15c9a702382cce098241b5dcc620f06f2ed955cfa044b4fbba