Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5b041064670412…

MALICIOUS

PDF

84.6 KB Created: 2021-02-26 20:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 76c7e5e31b659526bfeff537ac715702 SHA-1: 556f3a784cfec3f1afb4291d841481cfb8fd165f SHA-256: ad5b0410646704122bd88b75b83a424fc344052fc38df817d63c1cdcfba80722
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services like Weebly, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/strik?utm_term=how+to+sync+bluedio+wireless+headphones PDF link annotation
    • http://fitness-ital.fun/956910864266uxy0.pdfIn PDF document text
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/mamag_mirukobegis.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/76936896011fqgyo.pdfIn PDF document text
    • http://aycotoro0.xyz/sir_arthur_conan_doyle_short_storiesr3bp7.pdfIn PDF document text
    • http://interior.estate/xulegenutavedimuzs72k0.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/2108807.pdfIn PDF document text
    • http://familyit.pro/hindi_film_2015_dilwaletfsin.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/zesomudekatasofa.pdfIn PDF document text
    • http://goldstein.capital/beyblade_burst_rivals_game_guardianiy2og.pdfIn PDF document text
    • http://shopsmmv.site/practical_file_index_pagec4x5t.pdfIn PDF document text
    • https://jugovufepejeja.weebly.com/uploads/1/3/4/6/134611134/69033b19.pdfIn PDF document text
    • https://vadururufuwowo.weebly.com/uploads/1/3/4/5/134581676/95357f1e148f12e.pdfIn PDF document text
    • https://xalemutaxites.weebly.com/uploads/1/3/0/9/130969461/0c19c.pdfIn PDF document text
    • http://zelopaqq.xyz/kedevedivavmbir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_600c8a76a9144.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/bb1bec.pdfIn PDF document text
    • http://hookup750.website/after_livro_2_onlineo03ou.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 5456 bytes
SHA-256: 1e0882e36342330f9aeb70b9112e30db02507cfb97de351dbef0c29db3662ee6
font_01_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 2520 bytes
SHA-256: 82237b993c6d98ffe35f9314e5448189fdeaea23488e23f16f9696cbb8ce5181
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 10800 bytes
SHA-256: 8bc0da08dc3b4025176b1af9f562d7fec9ff172cc1998916352a220c5979c892

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