Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8866291059f5136…

MALICIOUS

PDF

65.5 KB Created: 2021-02-15 18:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ca5f3c86dc90a11e31007f36370eee89 SHA-1: 8399167d798d9c64351e0a5696c8f26d9b42a555 SHA-256: e8866291059f513600b7613dc58456c12bf32a33436c2d27ed8ba7c2a7f1328b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=aprilaire+600+filter+price PDF link annotation
    • http://citruss.space/b._e._full_formx8op6.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jbWgh6l/avenger_build_xcom_2.pdfIn PDF document text
    • http://1cats.space/colors_worksheets_for_esl_studentszhart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5feba12146401.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/6LCihjc/myrkur_folkesange_lyrics.pdfIn PDF document text
    • http://dietnatur.fun/zombie_blast_crew_offline9gd46.pdfIn PDF document text
    • http://shoop-ft.ru/2nd_grade_math_worksheets_freepsjg2.pdfIn PDF document text
    • http://xelirap.22web.org/athome_camera_home_security_app.pdfIn PDF document text
    • http://fastcreditcheck.info/clash_royale_private_server_online_noll2sr.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/iiiMxic/mx_player_pro_apk_free_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_5fcdfa4426985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://watekiz.rf.gd/mbc_bollywood_guide.pdfIn PDF document text
    • http://vimobuzu.epizy.com/67386647820.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/29794730849.pdfIn PDF document text
    • http://zekubegem.epizy.com/zukelaxebuvu.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_off0000c3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F6 5116 bytes
SHA-256: a0b0c8e5b2d3f19a993ac2e7c67853f899a267e39974d9abc36e6d4ba21caf0c
font_01_sfnt_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 10832 bytes
SHA-256: 2bfa2d90fa2c815a2720f54946c38bd3b282c2d01d2bbd8ba0bfd157d63a015c