Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffec33c5a83c67a2…

MALICIOUS

PDF

80.6 KB Created: 2021-02-28 07:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9094bccb47bd8fe79a794949e2fe8563 SHA-1: 797365fde19c545f10476f0452c1c31b0dc5aa21 SHA-256: ffec33c5a83c67a24422bc689b06763b54fbf5ff13f8b7be936d8891d49563da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious destinations.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=resumen+de+todo+el+libro+volar+sobre+el+pantano
    • http://fopokigife.mywebcommunity.org/bezutupisusinekotajabo.pdf
    • https://totofogekof.weebly.com/uploads/1/3/5/3/135327731/8a4161ad4a3ac.pdf
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/pasapufetajopobokuk.pdf
    • http://nogurufegu.mygamesonline.org/7506284856.pdf
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/878e8e1c25a94f5.pdf
    • http://vawadofofasip.getenjoyment.net/mozekejunomup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pomisukiso.rf.gd/wobubuvonixulagimikunobeb.pdf
    • https://s3.amazonaws.com/dazovosugev/dbt_core_mindfulness_worksheets.pdf
    • http://pejibuturu.epizy.com/duxisesuwunipowulevifo.pdf
    • http://jokokimalofov.rf.gd/matplotlib_scatter_legend_size.pdf
    • https://s3.amazonaws.com/dowavelaxam/4337593354.pdf
    • https://s3.amazonaws.com/pewibim/email_asking_for_a_job_application_form.pdf
    • https://s3.amazonaws.com/bifamomove/chalkboard_font_word.pdf
    • https://s3.amazonaws.com/gogoxowiniza/peace_like_a_river_chapter_20_summary.pdf
    • http://ziwejozaz.epizy.com/nunuwi.pdf
    • http://devutoza.rf.gd/acheter_une_voiture_occasion_en_allemagne_formalits.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc44.bin
421ce020d959b32fb68fed8feb36edd7994c5872e9fdb3b1a4341c8f3be5e871
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 5312 bytes
font_01_sfnt_off00010e39.bin
a3e9aee383377480356548b6a3ae94240c0ace3887816f62454795f9f2e0789e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 11360 bytes