Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22423738c5b92ea…

MALICIOUS

PDF

72.3 KB Created: 2021-03-23 17:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c6b55cac865a9316825a5627a73ed676 SHA-1: 58014369a71a5bc7400e3715d86a87ae7e6c2151 SHA-256: b22423738c5b92eae5994bdc91f24455e9e24f0db207a96b944c946627429a30
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 0.9997

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://maypoin.ru/wix?keyword=tv+online+rcti+putri+untuk+pangeran PDF link annotation
    • http://bubuwem.iblogger.org/painting_easel_for_kids.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/d8a0577973f6d.pdfIn PDF document text
    • http://zukilobuzoroko.66ghz.com/pdf_file_merger_free_software_online.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/xamibebulosaxug/31254306636.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/zorijujifikubowatabanap.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/omron_body_composition_monitor_with_scale_-_7_fitness_indicators__90-day_memory_review.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/52658043986.pdfIn PDF document text
    • http://xakosafejel.epizy.com/polarization_index_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/playa_hermosa_jaco_costa_rica_surf_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/android_layout_background_color_gradient.pdfIn PDF document text
    • http://magelul.epizy.com/bowflex_treadclimber_2015_models.pdfIn PDF document text
    • http://kazoverowagodi.epizy.com/nojufepizaxemiw.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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 4996 bytes
SHA-256: 379b6f72929b3f2b4ccbb2b9ae7f2e60880c50a5389aa7aea5d1bba7eb8f7fca
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 10996 bytes
SHA-256: 13ba6072575e88496d45130b9e7d8653944cbf807824e8bfd120418e24d0aa7e