Malicious PDF — malware analysis report

Static analysis result for SHA-256 d318ffeff6be83bc…

MALICIOUS

PDF

67.4 KB Created: 2020-11-23 21:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bd30497b0bfc765b4e303805acc54559 SHA-1: d3015d9d82837e89f59e0c26134217c3d34d727e SHA-256: d318ffeff6be83bca87806c180a25d27bdaabe357d01597b927ef48e8806ad22
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://trafffi.ru/strik?utm_term=macromolecules+lesson+plan', is flagged as suspicious and likely leads to a malicious site. The ML classifier strongly indicates maliciousness, and the PDF structure with embedded links aligns with techniques used for distributing malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://trafffi.ru/strik?utm_term=macromolecules+lesson+plan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fbb7e9937d03.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/fusominijoke.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/wakujek_moxatulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f8a0e48a831c.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/2017246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5f92a8599dc7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novifamigot/what_does_offer_phase_ext_mean_for_usps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e7cfb5-d66f-4eb9-8f3a-693d4e6cd834/bejiragojisosokivebizug.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/padineteludinuzukarefito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a06161f-fac5-44fe-bdd1-8c3a5ee9294d/95061975090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ceca72-877b-4512-96ea-9c5444f5ed59/word_families_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d304ff7-4e77-4de5-93b6-7231bd8a6332/wivigowufuxelimumima.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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 5084 bytes
SHA-256: 8fb860bdcb7f68a2c114feb3e9ebd0444a2ecfa48bc473205a62e0b2da89f45b
font_01_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 10672 bytes
SHA-256: e2e3fce3eb143a6975ee0c63b44003565900bf1ae660717bbfcdecaeacda87ff

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