Malicious PDF — malware analysis report

Static analysis result for SHA-256 266047d10f427f7d…

MALICIOUS

PDF

78.0 KB Created: 2021-03-16 22:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ec5771da4c70202975bcf8f46854d370 SHA-1: 347ec724ca405fca6677755d3f891f635da43ca8 SHA-256: 266047d10f427f7dc223a800844fe99605802cfef44cdb33f4e404f674a62aae
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains and link farms. This behavior is characteristic of SEO spam or a distribution mechanism for further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous links on potentially untrusted domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://gimoguvi.ru/wix?keyword=wiiflow+wii+channel PDF link annotation
    • https://cdn.sqhk.co/padekopa/lsnSRHF/sipukinikosopokadux.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/nGjdgiO/strikers_1945_mod_apk_free_download.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/tawuv-gakumezuwo-dipujus-joburupomuxefu.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/nigekofikuris_zebogupute_kowobumazixen.pdfIn PDF document text
    • https://cdn.sqhk.co/pipidopowewe/bpRP47J/kevazimojixazevosiz.pdfIn PDF document text
    • https://fozanisatede.weebly.com/uploads/1/3/4/6/134691357/8878662.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ihYzZBL/criminogenic_capitalism_definition_sociology.pdfIn PDF document text
    • http://fortuneo.best/mpandroidchart_pie_chart_examplelqohn.pdfIn PDF document text
    • http://xodulik.66ghz.com/89808112971.pdfIn PDF document text
    • https://zazivepug.weebly.com/uploads/1/3/4/3/134359823/latusajab_kaxukozojirodar_japevujavut.pdfIn PDF document text
    • http://roxebil.22web.org/word_power_made_easy_by_norman_lewis_latest_edition_2020.pdfIn PDF document text
    • http://stc-l.ru/xubebopenanetixlyxqa.pdfIn PDF document text
    • http://nncucuucuc.space/cetallerg_sandoz_information0qiv2.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/motu_patlu_cartoon_free_video2uxap.pdfIn PDF document text
    • http://daliadiago.com/baul_gaan_mp4_freewvyu5.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/pexor.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/TLRYQiG/sprinkle_islands_games_download.pdfIn PDF document text
    • http://itwow.info/83183943140mixxz.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/hgAUQgc/virtual_races_2020_medals.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/hbgfU5O/torotasodogozesufo.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/icThg7Z/cara_download_smartmusic.pdfIn PDF document text
    • http://com-servers.online/pulgadas_a_cm_tabla_convertidorkodmn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosawivigibi.rf.gd/43952628974.pdfIn PDF document text
    • http://fezadup.rf.gd/82635910178.pdfIn PDF document text
    • http://fabovodowep.epizy.com/20202727830.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_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 4800 bytes
SHA-256: a65f6365af1b62b0219ed3cb82b9d269288e748a83e320060b3276e180fa5885
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10976 bytes
SHA-256: 04ebca0355e7d5b9fc9f61e541b3028425ea784dd4c6caa5aebd83ae5ec75df1

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