Malicious PDF — malware analysis report

Static analysis result for SHA-256 923cf22dffd7871b…

MALICIOUS

PDF

90.7 KB Created: 2021-02-28 08:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7de00d0214a1d07078bd0063edefde7b SHA-1: df6f940eadac477a27e5a2914bda19eb184eaa93 SHA-256: 923cf22dffd7871bcea23a07057f63d981e3bbbd18cd2be26a8b1c0ecfded56b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to the endocrine system, likely to trick users into clicking the malicious links.

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://dugedepap.ru/123?utm_term=el+sistema+endocrino+partes+y+funciones PDF link annotation
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/zaxubijuto-welominajuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380539/normal_5fdc94e9daa34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fede5952c98a.pdfIn PDF document text
    • http://tublitalia.fun/she27s_the_man_full_movie_123moviesm05ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_5fe793b4304a9.pdfIn PDF document text
    • http://pubgucbayim.com/kusuvea8rmw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405899/normal_60010af729b1e.pdfIn PDF document text
    • http://itprod.space/dr_pestana_surgery_notes824bq.pdfIn PDF document text
    • http://opencabinets.xyz/piwofafowepaiehhd.pdfIn PDF document text
    • http://rafale.store/79038494248j80tr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_6039efe24a37c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5fe45821562b1.pdfIn PDF document text
    • http://health2health.online/52523373485vj38t.pdfIn PDF document text
    • http://lnstagramcentre.net/progressive_auto_insurance_contact_informationi5mvt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470703/normal_5fe445b890c2f.pdfIn PDF document text
    • http://dimax.website/voriponogolug4pti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojurasonalefan.rf.gd/mettler_toledo_xc3_checkweigher_manual.pdfIn PDF document text
    • http://bidasumibave.epizy.com/south_african_vat_invoice_template.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_off000122e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 5360 bytes
SHA-256: 30b0c4210813dfe92d6b5bf06d9a6a29f231de99bb25b1d999ce76122d199bfa
font_01_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 11856 bytes
SHA-256: 364ac1dbbc186a45ae46224c8f3705a1dd10d1d9b2c163e582f670de4d9a01b9

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