Malicious PDF — malware analysis report

Static analysis result for SHA-256 43af5d6666854684…

MALICIOUS

PDF

74.2 KB Created: 2021-04-07 10:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da8b78f92a2def4c1006ff2e8edf4a6 SHA-1: d6954224f8e97774ef179b05c73f398529f06b64 SHA-256: 43af5d6666854684bbde4d06455fcac21767bcdfe4bce893e73a47227edbb042
156 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 to benign-looking PDF files, suggesting an attempt to create a link farm for SEO purposes or to obscure malicious links. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, possibly leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=introduction+rondo+capriccioso+saint+saens+pdf
    • https://cdn.sqhk.co/rifasidajika/hhjCrjh/lothric_high_wall_guide.pdf
    • https://cdn.sqhk.co/nefakovuwot/FhaJif8/62172237499.pdf
    • https://cdn.sqhk.co/lobitukojuro/ZDTDIgh/41140172703.pdf
    • https://cdn.sqhk.co/pifajaloro/eUrBial/star_wars_movies_in_order_timeline.pdf
    • https://cdn.sqhk.co/nuxegaxujifo/piaGLgj/zuvotarixujojuxi.pdf
    • https://cdn.sqhk.co/petebeki/hagccWr/64506826270.pdf
    • https://cdn.sqhk.co/wazafepel/29Vxg0D/korikipoj.pdf
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/cce22b44f.pdf
    • https://wopamogifit.weebly.com/uploads/1/3/4/3/134341426/f6c6b34ba9d7dc3.pdf
    • https://cdn.sqhk.co/kavejufa/hbQK8Cy/smartwool_socks_women_s_size_chart.pdf
    • https://lesamasipedu.weebly.com/uploads/1/3/0/7/130739144/nuvodulisero-nigowo-popavemexodigid.pdf
    • https://cdn.sqhk.co/xuwadezab/uStQgeP/eugene_sheffer_crossword_clues_and_answers_list.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mamibis/jquery_form_submit_button_disabled.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/jubudif.pdf
    • https://s3.amazonaws.com/jenisozazewubo/rezajimulegokujupebori.pdf
    • https://s3.amazonaws.com/fazujo/bekaboo_full_series.pdf
    • https://s3.amazonaws.com/tiniruru/kebovutiwekonesawega.pdf
    • https://s3.amazonaws.com/wiwuxot/electronics_engineering_free.pdf
    • https://s3.amazonaws.com/fosalizuzu/19452354600.pdf
    • https://s3.amazonaws.com/vososasoxumete/whats_the_order_of_the_metro_games.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_off0000e228.bin
5a4b049d21a8f8c3ce50d367d48d43d6b26bcf66d48308ec344b9706607a0911		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 5052 bytes
font_01_sfnt_off0000f363.bin
1100c03c9f087b89f09b57224b9a1181db71b0a1e07074ec04c76f71282c6297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 11216 bytes

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