Malicious PDF — malware analysis report

Static analysis result for SHA-256 4321694526911aaa…

MALICIOUS

PDF

71.1 KB Created: 2021-01-24 02:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c455e6ecc4a893730822c3c34d4dfc75 SHA-1: e401474dc5912cec19eed53ea6dbb55a752f728a SHA-256: 4321694526911aaa7ef69180b016b8749178a563a3d89fb54491ef2d880b8a79
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it hosts numerous external links. One of the primary external URIs points to 'bologen.ru', suggesting a malicious redirection or content delivery. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=ternak+cacing+sutra+pdf PDF link annotation
    • https://site-1180237.mozfiles.com/files/1180237/38188149315.pdfIn PDF document text
    • https://site-1168481.mozfiles.com/files/1168481/linabezuvifafijo.pdfIn PDF document text
    • https://site-1207210.mozfiles.com/files/1207210/spirit_halloween_animatronics_pennywise.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/gohClia/7905191686.pdfIn PDF document text
    • https://site-1195783.mozfiles.com/files/1195783/ruriwotef.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/texinokabadikat-fumaxoxuji.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/31dfe.pdfIn PDF document text
    • https://site-1176998.mozfiles.com/files/1176998/asia_pacific_map_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupefapakag.rf.gd/company_christmas_party_flyer_template_free.pdfIn PDF document text
    • http://koxowasone.epizy.com/beautiful_girl_child_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/39423228771.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/bisi_alawiye_live_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/church_posters_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bohemian_rhapsody_sheet_music_alto_sax.pdfIn PDF document text
    • http://xujogefup.rf.gd/brand_positioning_strategies.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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 5304 bytes
SHA-256: b92b24c5f77d25eda0da94a06a31e1f85ac868bad81483a5f0da0e1f5c3f2921
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 10744 bytes
SHA-256: 270eeef01f88bdd0e8364d76b2a440a98786438feebec6b634de2347b9aa1a3d

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