Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f33e100d1042e4f…

MALICIOUS

PDF

76.9 KB Created: 2021-05-21 23:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae41695ee69693a55190995f6d4662b6 SHA-1: e54f080189d863f7a66000db2a5eb145c34639e3 SHA-256: 3f33e100d1042e4fbf032a8e978d108501161f252f1c65ad976d8c2fb4008d69
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/strik?utm_term=war+movie+2019+google+drive PDF link annotation
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/9963e30ae728313.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/nofefozenunak.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/demisapo-vesejunata.pdfIn PDF document text
    • https://pidolanapeg.weebly.com/uploads/1/3/0/8/130813957/xuwugiwipuforami.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/e50fba4d7295c4.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/subatotoziwofeba.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/8124269.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/xopadixubojazi.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/5411953.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/6983851.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/vakegaluvem.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/9e4844724e.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/sidekituni_ranula_tutunak_reliparuxubugi.pdfIn PDF document text
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/6975967.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/dilomov_nalugebado_maneledona_kotutotipufot.pdfIn PDF document text
    • https://gekuxufetog.weebly.com/uploads/1/3/1/3/131384115/32500930a34.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/xulad-jibowapidaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6007bb-a3b3-4f90-a808-68fb3d23b82a/3862775889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eecea8c-230e-4eaf-9f3e-8325100f395e/what_is_the_book_rodrick_rules_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5866c78c-0aec-49a3-850a-951d693bd8f7/casio_fx-991es_plus_scientific_calculator_app.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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 5520 bytes
SHA-256: 47163a8c9b796e74c8f5e52959ae7213d13ef5bb06b41571ac43d2cb75b9b92d
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 11080 bytes
SHA-256: 9076dfc086f27800844550f1b7248783cfa33c1257735f0723f75e7657ce5de6

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