Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce8358edb6aa0f1…

MALICIOUS

PDF

69.9 KB Created: 2020-12-13 17:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4ae6fb09fad351073f5d3bfe15fb48df SHA-1: 27cb1ee7ea5ffa4eff55466537d17b65f595e5f2 SHA-256: 8ce8358edb6aa0f1765d4954af37145230d0bc770e96fd6cef38e82baeee7ef4
156 Risk Score

Malware Insights

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

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffset.ru/strik?utm_term=average+speed+equation+calculus PDF link annotation
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/kijos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfb2312cf09257bd651d14/t/5fc16e9ce18c5c478e31fd39/1606512284271/vaxogeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/43041614502.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/performance_enhancing_drugs_in_sport_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/blank_puzzle_template_12_pieces.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/atom_editor_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/kopilinobapavurafa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0f943485235c868cc1ca/1606291348804/17928549493.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/graph_theory_in_discrete_mathematics_notes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d446ab79f442f2293e00/t/5fcc826e2fa8bc6bcde2ad8b/1607238255214/94069279956.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/vufuw.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/john_deere_44_snowblower_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/google_chrome_offline_installer_filehippo.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_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 5416 bytes
SHA-256: 63a0614345d72d274184f0237ec6d22fad301a0e0f1fc4772d0d4f6e8750c88a
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10924 bytes
SHA-256: c9958884365b65b24310e468eccf587eaf0ed33b7a7b08fe254c6bb001ed3a0a

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