Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adbbd2f5b6e3634…

MALICIOUS

PDF

91.8 KB Created: 2021-02-21 23:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 405d9cbd6d4a8e161acf0a4128534dac SHA-1: e89575affdbb75ed0581f28efb7b5f5f56c74561 SHA-256: 4adbbd2f5b6e36346de39d31703afa64676fc61306c678dc59dedfae582d7998
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to PDF files on various hosting services. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to drive traffic to potentially harmful sites.

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://leonvi.ru/wix?keyword=centripetal+force+worksheet+7.2 PDF link annotation
    • https://xutawolovunoka.weebly.com/uploads/1/3/0/7/130739399/filov-mizodopugu-maronobejuruvi-wagakaji.pdfIn PDF document text
    • http://alisabor.design/brooklinen_sheets_washingbqyv3.pdfIn PDF document text
    • http://ch-redirect.icu/rimovedofikedukudet52h1l.pdfIn PDF document text
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/3822071ee50b76.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/xubumemazovatekenus.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/sijabevugemewul-dikaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5fe3c2d28cdc4.pdfIn PDF document text
    • http://mantenancie.com/tuzubozetavipix8vt6.pdfIn PDF document text
    • http://mp4.design/where_is_bank_1_catalytic_converter_located7ibu7.pdfIn PDF document text
    • https://zumavoga.weebly.com/uploads/1/3/1/3/131383266/lufitefure.pdfIn PDF document text
    • http://keto-menu.online/sazekololobajua9cm.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/vavejijitatofu/wipivibinusikumileka.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/carotid_doppler_waveforms.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/womisojobunoliveviwi.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/aha_2017_hypertension_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/10328767456.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/android_auto_mirrorlink_hack.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_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 5408 bytes
SHA-256: dbba1329d114de8378d0a11093d4b63d95377966ad117f44e0a6dd8bf70c14a5
font_01_sfnt_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 10196 bytes
SHA-256: 87ab965bdffb225cf96ce66f0220657bf5ad0afcc9089188855700baed8d1523

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