Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ece931b8236a18…

MALICIOUS

PDF

74.8 KB Created: 2021-02-27 19:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: de4ae02bc8a6f302d3df6ff53f690798 SHA-1: 327f2468fdeb505b24036d1e3ba8e21b28d6c8c0 SHA-256: 64ece931b8236a183fd8edcb676dc1f41324954bda21b04f053e38aa6cfd8f1c
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://resalured.ru/strik?utm_term=what+grade+level+is+640+lexile PDF link annotation
    • http://vodabutopidaru.getenjoyment.net/66151762023.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/3jh5wbq/best_unlimited_high_speed_internet_plans_ottawa.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/tigajesamukumokebabibi.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/KPhghbn/34262208607.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/38550168212.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/what_is_the_newest_ps_vita.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/ajes92l/sufepobuzenox.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/how_to_clean_ratchet_straps_by_dirt_farmer_jay.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/wiwomusudu.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/iUqgcbt/zolumukilivedamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/wimpy_kid_dog_days_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/hungry_shark_world_apk_mody.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/bibitogudosoge.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/45213530649.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/84103076325.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5612 bytes
SHA-256: 5ce90959df7ebce17fd2acbbf2130d8aa9e4f462813540625892c57bafa2efca
font_01_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10764 bytes
SHA-256: 670bb6c62e2f93f95477a895d89f0bb3fada356e77201544039e42c3651cdac4

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