Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea7b2078761acca…

MALICIOUS

PDF

99.7 KB Created: 2021-03-17 13:06:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ec6f96c58b79050ad08fa1f3bad099d8 SHA-1: efc147134e4f4e66fed7964775d7ffaa9d4fa5d9 SHA-256: 6ea7b2078761acca43fab6a0ea20386e1b3ff0bdd944fd499967057b0dc9be02
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, containing a large number of external URIs pointing to various domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to redirect users to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+did+europe+change+after+ww1 PDF link annotation
    • http://lajodibibodi.getenjoyment.net/cancionero_navideo_cristiano.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/raxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/idyjhie/hd_camera_pro_apk_mirror.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/dovatazugizaweja.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/gdChjge/bad_2_bad_extinction_premium_apk_mod.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/memabe.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/25d9e.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/ejiaKgf/9639550993.pdfIn PDF document text
    • https://loxoratas.weebly.com/uploads/1/3/4/5/134507201/marewowa_fumawobufon_mobitusev.pdfIn PDF document text
    • https://puwexisafiza.weebly.com/uploads/1/3/4/5/134586360/01fb26bf2ac.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/how_to_reset_avital_4103_remote_starter.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/bofugatesobotus_kogagojijuje_venijudugakur_wotokeziba.pdfIn PDF document text
    • https://cdn.sqhk.co/famogidoje/Sjjjigg/steam_dropping_to_0_bytes.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/sakoluja.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/namakotajakofabil.pdfIn PDF document text
    • https://rafopotoze.weebly.com/uploads/1/3/4/6/134609035/lakilasijenemu.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/kovilowab/how_much_to_rent_a_carpet_stretcher.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/business_plan_for_small_cafe.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/27201660650.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_off00014a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A86 5312 bytes
SHA-256: 2df334701bf5e87c4f83244d10394360f90d37b2fbc5b0fb3ddd8a9df980a416
font_01_sfnt_off00015cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAC 11044 bytes
SHA-256: ade6d1fc2c5b52c0bda67732b16a00fe8242f0d074248d5bea845347d61a07f0

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