Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d072fb02944baf4…

MALICIOUS

PDF

77.3 KB Created: 2021-02-14 23:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 267e9f8078b9be96f9f41a1c957d0adf SHA-1: 33258eb027b95a7e667fa86123f93641ef3341f2 SHA-256: 6d072fb02944baf4a9c13ec5ce6203f8f9b13f07a3b81fcb9e81c9f925b59289
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing lures, disguised as a service manual. The ML classifier strongly indicated maliciousness, and the presence of many Weebly-hosted PDF links suggests an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and extensive URI firings point towards a malicious document designed for initial access via social engineering.

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://baarspo.ru/123?utm_term=2010+hyundai+accent+service+manual+pdf PDF link annotation
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/nozajar.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/013f45d3f6517.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/5889215.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/cc1f40b1.pdfIn PDF document text
    • http://tk-time.site/all_idioms_and_phrases_with_meanings_and_examples8y6y9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/julexekubaj/sublime_text_format_xml_plugin.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/demonic_gorilla_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/38151362639.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/gelavaginoxaguruvabebem.pdfIn PDF document text
    • http://biborufa.epizy.com/sivemexowotomiripanubaji.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/kendo_ui_grid_template_if_else.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 5560 bytes
SHA-256: 613084f8221f9b98ddb2c9fc3ab05fd9b0851a2f65f4ad46575ffaed446be2da
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 10848 bytes
SHA-256: b93f4b7bf0a95bf49b1e0c6a42ea4eea5240a5b79b5d945f83d1e72e6b954c92
font_02_sfnt_off00011a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A71 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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