Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbd338d8b152886…

MALICIOUS

PDF

77.6 KB Created: 2021-02-25 16:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ddd24be78f61bc97f3e0ac6f374b0f43 SHA-1: 7b5c9ac7c2d471b6c0e8249120fc0e64115f771d SHA-256: 5dbd338d8b152886ac002e36dad0b80d9a34e54d548d21968ba9d7c9586487e3
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 pointing to disposable domains, and one specific URL is flagged as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

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://maypoin.ru/strik?utm_term=torment+movie+lauren+kate+release+date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366401/normal_6004f6d0e99bd.pdfIn PDF document text
    • http://vogeposekuxav.66ghz.com/3468758903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fc8d22f7dc0b.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/guest_services_supervisor_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_60155776ae03b.pdfIn PDF document text
    • http://wofaguwere.iblogger.org/xuriwolefuzutasogumosurek.pdfIn PDF document text
    • http://rowifir.22web.org/us_army_honorable_discharge_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6036be7d22cb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojemoditupu.rf.gd/gesafumatus.pdfIn PDF document text
    • http://telewazikenap.rf.gd/bloons_td_6_new_update.pdfIn PDF document text
    • http://perurafofasiw.epizy.com/vezeloliletelafirafut.pdfIn PDF document text
    • http://vonupov.epizy.com/jejenumixitinelubofajamol.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/aeronet_data_format.pdfIn PDF document text
    • http://jujilopuvij.rf.gd/negagupobizewop.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/girazepufona.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/resume_template_for_today_s_job_market.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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 5044 bytes
SHA-256: 61e00ff10bc53f4f60845bee98e64609277a928e265c48723b8ec21f2b06a6c4
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10588 bytes
SHA-256: 399ec0d2cccfe76c3ab023bdec7b255130262848c99e5f7f62cd69ed621e9a0f

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