Malicious PDF — malware analysis report

Static analysis result for SHA-256 279bb1f66f2b14ca…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 06:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 472ba45f2977d23d2f23a43616fcaf7c SHA-1: 53a434cde519c5eaebcce51bd0a0953de9d225be SHA-256: 279bb1f66f2b14cace90acbae966cb0c80dba3d14733a159595bcd6751b566ef
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://kuzutuzo.ru/award?keyword=exhibition+planning+and+design+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465015/normal_6037a7d2db8d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_60006a6fa3b65.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/2286635.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/63316500075.pdfIn PDF document text
    • https://fakedowekiz.weebly.com/uploads/1/3/5/3/135314463/5eaebf0b91.pdfIn PDF document text
    • https://cdn.sqhk.co/rajosibakulu/fkHjgig/splashlearn_measurement_games.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/dda7cfe650cc2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fec8d23d8d12.pdfIn PDF document text
    • https://sowuritujozefa.weebly.com/uploads/1/3/4/6/134621612/8863771.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/Sgjiahd/should_i_update_samsung_experience_service_center.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukasuxoseki.atwebpages.com/britax_advocate_clicktight_arb_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/lunowunabokarepavewer.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/executive_director_interview_questions_and_answers.pdfIn PDF document text
    • http://zivosefim.rf.gd/baldur_s_gate_dark_alliance_2_gba.pdfIn PDF document text
    • http://wikolote.epizy.com/tovotaxewanu.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/calories_in_arbys_beef_slider.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/66280972091.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/52496018344.pdfIn PDF document text
    • http://zelawiture.epizy.com/rusawusasuwun.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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 5372 bytes
SHA-256: 7e5302ada6a97cd325f20f82da016f8c26c07797ba801c1c63ca0773f31bdd64
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10788 bytes
SHA-256: 10dd754f77a8de85f0411c46b2b1c1e02e9d9045e8413e24ef1a1cb3882a709e

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