Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d279ecc18414ff…

MALICIOUS

PDF

77.0 KB Created: 2021-02-26 01:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 56e6c92bc219a8be21fb65d7767742af SHA-1: d6708ed55bcb3607c929df65c94ffccd72e41085 SHA-256: 61d279ecc18414ff2fb5926db1450eebdc3f46f206ac82ae423df53c5261bed3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=divaldo+franco+livros PDF link annotation
    • https://kogozifimasubi.weebly.com/uploads/1/3/4/1/134131491/xagok_revimiropi_vorugumar_xewefonolakexob.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/bitovedamuw.pdfIn PDF document text
    • http://1cats.space/temperamentos_transformados_livro36xro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481408/normal_5ffef28f64ccc.pdfIn PDF document text
    • https://fovinerorowabas.weebly.com/uploads/1/3/2/6/132682717/7433601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_6015a0ba4c973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fef1b9e1331a.pdfIn PDF document text
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/xivukuwusumat_xowezuvope_kaxugob.pdfIn PDF document text
    • http://salearea.pro/what_is_the_purpose_of_the_pmbok_guidexm9hn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_5fd642783b19c.pdfIn PDF document text
    • http://ragukir.iblogger.org/25967062205.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/gupurunejigizut.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/kikeginopitabupewu.pdfIn PDF document text
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/zesunufazaxezum.pdfIn PDF document text
    • http://naxovonukile.iblogger.org/adverse_selection_model.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midetawedafete.epizy.com/tumujetes.pdfIn PDF document text
    • http://luxotenudiwuzu.rf.gd/kerusufalotex.pdfIn PDF document text
    • http://masuroti.rf.gd/16286323116.pdfIn PDF document text
    • http://pibasas.epizy.com/85377743251.pdfIn PDF document text
    • http://xenavak.rf.gd/is_there_a_reset_button_on_a_samsung_refrigerator.pdfIn PDF document text
    • http://metusajixano.epizy.com/utorrent_free_for_android_mobile.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_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 5076 bytes
SHA-256: 84649dd53dabbb13839d14fbd72e6aea531adf68124c596a555ab5216e705d32
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 12440 bytes
SHA-256: f5c280889d826120ddfbe88ba864c2f425f83db0b8405fd41f2cd1916bfbf4aa

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