Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba158aedac7ff871…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 11:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 83cc27d4a4bbfca139c58be8aa7990ab SHA-1: 5ac8b557972ac96d20b00b0efe6bd830a99bd08f SHA-256: ba158aedac7ff871e365e42541f908ece63f2ade84a1aa0e0b4a589a39f561e8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary links, 'https://mezovuduw.ru/award?keyword=is+sociology+a+science+debate+pdf', appears to be a lure for users interested in academic topics, leading to a collection of other PDF files. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the structure suggests a phishing or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=is+sociology+a+science+debate+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5ff4a5e7c824c.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/materialismo_historico_unam.pdfIn PDF document text
    • http://mupifojoxur.medianewsonline.com/jopediwidotulizimex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_604e36bc6fc0e.pdfIn PDF document text
    • https://tateleref.weebly.com/uploads/1/3/5/3/135322569/d3cd45b2dd6.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/97606598214.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/tozitupatug-zabowazuvezaf-bilus-wipuresapakebi.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/59321894488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_6060e488df28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_600b01df49dfe.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/31229920248.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/reverse_chronological_resume_sample.pdfIn PDF document text
    • http://mareson.getenjoyment.net/sordelli_microbiologia.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/bupesejirijejus/pabotuvuvuxugusenafa.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/twitter_post_template_png.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/julokeretisofatetiwerut.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/83270035812.pdfIn PDF document text
    • http://medexode.atwebpages.com/gumalunofigo.pdfIn PDF document text
    • http://dazejifudora.onlinewebshop.net/rumewavezopexofadexexogo.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/56962699830.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/high_cholesterol_foods_to_avoid.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/41326726989.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/photosynthesis_journal_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/good_will_hunting_script.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_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 5408 bytes
SHA-256: 6dccb566ff5e979c34dbab19003516d938df56c82625579e8ee6a1851593efbb
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 10212 bytes
SHA-256: 958a8adf0d0621e771d9d417133b02a55cc13f1a96129a8adad4075c4f8dc46e

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