Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0cb3fec9d17e00…

MALICIOUS

PDF

80.0 KB Created: 2021-02-13 02:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ca2b17a02505d363adc73bfbfd7e7442 SHA-1: 959eb015c0ff3e36118047b0ffb417e3f066f5e0 SHA-256: 1c0cb3fec9d17e002b634b0365f884dfd179c2f1e85a557921c440ecf2bcb92a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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://baarspo.ru/wix?keyword=wets+and+drys+heraklion PDF link annotation
    • https://boforotove.weebly.com/uploads/1/3/5/3/135393238/jamubumisusa.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/MjgGTk5/27174720440.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofabope/ciiidRT/paper_toss_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/jd5ijXT/sigasume.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/4oHhf9R/temifal.pdfIn PDF document text
    • http://glossywp.online/weed_eater_blades_stihl26wny.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/qoaijP9/word_blitz_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/vidoperife/hfNliit/21432544422.pdfIn PDF document text
    • http://masonufidowex.iblogger.org/microsoft_word_graduation_invitation_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/bzeigDv/free_radio_classical_baroque_music.pdfIn PDF document text
    • http://ptmonline.ru/sulise1r13i.pdfIn PDF document text
    • http://kinorio5.xyz/resident_evil_4_36_trainerwpa7m.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/3342051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeraginijumeje.epizy.com/38043747102.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/fact_or_opinion_worksheets_for_grade_1.pdfIn PDF document text
    • http://lokemuwebofeg.rf.gd/sustainability_report_air_asia.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/shutterfly_share_sites_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/linavigovinifilod.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/allium_bulbs_planting_guide.pdfIn PDF document text
    • http://jipokogave.epizy.com/acknowledgement_of_paternity_form_new_york.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 5092 bytes
SHA-256: 51a0920437532cc9c7e1764cdcbc6b84cddda01c330980881cafd664a35a2f93
font_01_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 10720 bytes
SHA-256: f9bc3610ed52bc4b2cc6c3f578f1da2178faf89e9f8d0b451c915aa48c40fb81
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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