Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0c8ba3c88ccfb9…

MALICIOUS

PDF

75.6 KB Created: 2021-02-24 07:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 18a3cefa1b69db82cd8f3aa21095fea6 SHA-1: 8138f889647bd2efc4ba4076849868abdf30d159 SHA-256: 7d0c8ba3c88ccfb99e06271c7d082522c07f912ef3d2d46017c812d449900b3d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://seumenha.ru/123?utm_term=add+column+to+table+in+google+docs PDF link annotation
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/8788017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_60155947d0c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fd3062ba219a.pdfIn PDF document text
    • http://steelsho3.club/43079529089fm4uz.pdfIn PDF document text
    • http://frasqen.online/alita_battle_angel_full_movie_1993qo4jy.pdfIn PDF document text
    • http://exemplpusj.com/free_water_parks_in_tampa_floridai6n3o.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/0jjNeSl/download_brasfoot_2020_registro_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6012d36f87f63.pdfIn PDF document text
    • http://kindraretterath.com/11090433468alb3h.pdfIn PDF document text
    • http://abzac.me/cctv_camera_repairing_coursehofsf.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/rpYjagh/yellow_checker_star_taxi_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/iKXg7OM/legacy_of_discord_furious_wings_hack_for_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/nlgjje8/donakakeniluvenojiborerar.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/patotale/24279971517.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/arduino_projects_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/sukaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/men_s_style_guide_40s.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/fidinanikagomo.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5292 bytes
SHA-256: f4c86e3d5c66f733095ab978debd7ddd93c07fff60267fad2ca497b30a9ee2d9
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10860 bytes
SHA-256: aaaf861f6f1632c87486d25806870ae46e1ad87f0d15072a4204f52919d0c191

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