Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dc87f41003d0cd…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 13:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 84fcdbd57b2478203f62b31778c09146 SHA-1: 9ac392c8dd0ba9db83a7859e154a2b46422b7d6e SHA-256: e0dc87f41003d0cde29b620690406d2238b81a4e1cb9c41b34db8fcf77e078a6
186 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 0.9991

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=how+to+work+out+the+perimeter+of+compound+shapes PDF link annotation
    • https://cdn.sqhk.co/pumafuki/h8TNQQ8/narolezurimefun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_601815d050ac3.pdfIn PDF document text
    • https://cdn.sqhk.co/rasirise/negeyia/novixovesevaluju.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/gdmzyor/checkers_game_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/P7ig0F0/gizmohub_for_pc.pdfIn PDF document text
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/nopebawutef.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/mevidemujopime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5ffc349fd4d4c.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/fejovotopebofovojoneg8ju0y.pdfIn PDF document text
    • http://pl50off.info/salat_al_istikharazpz7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5fcbae4ddd47d.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/amjeWTz/45980178021.pdfIn PDF document text
    • https://valazasabo.weebly.com/uploads/1/3/1/3/131398294/cab8e6d445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_601675dd17db6.pdfIn PDF document text
    • http://natur-green.fun/wikulemobulexafannhgw6.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/jgijig9/gun_sounds_ringtones_by_zedge.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/shaPhgo/64166993941.pdfIn PDF document text
    • http://axecheat8.xyz/matthews_paint_mixing_systemu93q9.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/icOFmic/gewim.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/geraromu/dovupofowokeziv.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/when_can_my_baby_play_with_playdough.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/prepscholar_sat_math_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/57057408421.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/daloxuripeves.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_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 5480 bytes
SHA-256: 6ededf44724f5091e79e0581b7254a920a2f79ba2dc0b470a2f75aaa13f5e622
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 10428 bytes
SHA-256: 67fb656471168a4ae88bb3e72c824529d28a6fe2eeb84c8e16af8cecbd204f76

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