Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df6c354c7c4859c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 13:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9ba04e71db9d5d9b925b4b6206c22327 SHA-1: 545ace419d5a3780dff01455fd6d01fc10a909d1 SHA-256: 1df6c354c7c4859c6d979b868bbe00733efb0b02df60ac2b6431e6df4d42cab8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=look+long+white+shirt+tight PDF link annotation
    • http://xozivupanivos.22web.org/how_to_make_a_3_circle_venn_diagram_on_word.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/4heTkJR/should_i_learn_c_for_game_development.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/92840935268m8kp4.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/lChh55t/15745592677.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/ggd26QY/36322027197.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/jeheugi/download_microsoft_stream_video_chrome_extension.pdfIn PDF document text
    • http://netewe8.xyz/18811158849kvmll.pdfIn PDF document text
    • http://wirelessinfo.ru/siwibijupebafopadaviguminf15.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/gE666BZ/mejifamelizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisexugolozefa.rf.gd/suxibezutekudakamopa.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/mekugofowimipal.pdfIn PDF document text
    • http://fufajapikimideb.epizy.com/the_ransom_of_red_chief_analysis_answers.pdfIn PDF document text
    • http://gisuvax.epizy.com/jabariya_jodi_movie_hdmp4mania.pdfIn PDF document text
    • http://tuzipani.rf.gd/corporeal_beast_range_guide.pdfIn PDF document text
    • http://jokizexolej.epizy.com/calendario_epidemiologico_2018_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/dilijezogifanetarexitoj.pdfIn PDF document text
    • http://dimonejoxu.rf.gd/transamerica_secure_retirement_index_annuity_rate_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/mameni.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 4832 bytes
SHA-256: e6095380ddeff66a61d4e8496f76060cd57f8afac38e068dd5a21b51ece8d322
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 10504 bytes
SHA-256: 8cbe190995cc472f30c224d9b46d44a761250f748679da520d515a061c062393

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