Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ae7d45df2be4a3…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 05:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1a101ba1b383775d8acfdd3a1fb519e7 SHA-1: da24d066a9c22dc513a26257186ca36cb6589445 SHA-256: 33ae7d45df2be4a3a72385601c99e0aa8ffbbf958f62fe948963dbd990c22d46
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 external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards the document being used to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=acuerdos+comerciales+internacionales+pdf PDF link annotation
    • https://gizajosusu.weebly.com/uploads/1/3/1/8/131856374/088839e1a5f94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_601933af6257a.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/tokagezeteselajizotel.pdfIn PDF document text
    • http://dfds.in/82174884173498wt.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/9190519.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/3582699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5fe8ef1509687.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/22558734207.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/kebusit.pdfIn PDF document text
    • http://good-production17.site/zegaviseduvin6nf9.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/zumefum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fc57ca161fc3.pdfIn PDF document text
    • http://riforemepenog.iblogger.org/20737516733.pdfIn PDF document text
    • http://atelier-spb.com/mcgraw_hill_education_booksbvlr5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/binary_code_list.pdfIn PDF document text
    • http://dewakerulu.epizy.com/50986987849.pdfIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/98720318519.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/wudizute.pdfIn PDF document text
    • http://bemisiba.epizy.com/wasometukegivuzoxolufo.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/que_es_dieta_cetogenica.pdfIn PDF document text
    • http://dexedigobejo.rf.gd/best_bread_machine_recipes.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 5288 bytes
SHA-256: e0997e330a8a3f93a01dd9b6400291422964331d8896db6b9fe878c9ad472b1a
font_01_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 11388 bytes
SHA-256: 2eb3c09ad3b6c57a992431422392d00031200f662d662534bf43558c769868de

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