Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a98acea2d9b031…

MALICIOUS

PDF

94.4 KB Created: 2021-03-01 09:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 754dbda1a4677a44e5f85754b96f49e8 SHA-1: 271aad77854b928cfdabcda084b63ca7da4c987d SHA-256: 63a98acea2d9b031ca0c1b99a027697086614ec96697177cbf4733d6f1c8fe2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=qual+%25C3%25A9+ascendente+de+aquario PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426413/normal_60052372aca44.pdfIn PDF document text
    • http://winsbig.space/360210883869kdgx.pdfIn PDF document text
    • http://baykamif.space/samsung_rsg257aars_ice_maker_not_filling_with_waterwmxqd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_60349fb57bc41.pdfIn PDF document text
    • http://testersairf.xyz/regional_anesthesia_books_freeebn7x.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/wowawo.pdfIn PDF document text
    • http://g2am2e.xyz/entender_la_arquitectura_leland_rothgt908.pdfIn PDF document text
    • http://kupivse.xyz/x_ray_circuitpursh.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/commercial_cool_portable_air_conditioner_manual_cprb07xc7.pdfIn PDF document text
    • http://nowemuzasam.22web.org/pathologie_de_l_appareil_gnital_masculin.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/73189127085.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/kubukanawosoz.pdfIn PDF document text
    • https://mivezosikobo.weebly.com/uploads/1/3/1/4/131453246/doxeseg.pdfIn PDF document text
    • http://esplus.pro/20672589765e22aq.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/89871460751.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/6893700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwiweranewu.rf.gd/m_audio_fasttrack_pro_driver_mac.pdfIn PDF document text
    • http://dodixuvizovov.epizy.com/46787593207.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 5264 bytes
SHA-256: 37b56860198102431ce376cec9083143fefe69eb3a946369464ebf21050e6e2c
font_01_sfnt_off000143f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F4 12736 bytes
SHA-256: 21ba1839b6516fe5c1cd070fe1afe8685765915846bb6dcb9e45933a7ff02a44

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