Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f473c941af61c5…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 23:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e88f90f7b3ad03fe2d7ef2d0359bf425 SHA-1: b460a5838deb89c0e00d6ed76d45ca6ba62eddbf SHA-256: a9f473c941af61c5f58d74a5203aad0e1e93e873f7f6ba151fa67fccf0bf68a2
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to news and salaries, likely a lure to disguise the malicious intent of directing users to external sites.

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://ponafet.ru/strik?utm_term=can+you+put+chia+seeds+in+smoothie PDF link annotation
    • https://posesisex.weebly.com/uploads/1/3/5/3/135332701/183eb860d2de6e1.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/87583532599.pdfIn PDF document text
    • http://sexedate69.site/xinirunilazofigiluguy0r2z.pdfIn PDF document text
    • http://prodive.su/james_bertoni_code_fetishkxy7j.pdfIn PDF document text
    • http://nukels.xyz/barrett_jackson_2020_results_fridaya6ax5.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/briggs_and_stratton_725_series_oil.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/xeripege.pdfIn PDF document text
    • http://br1.red/297854208239k8qm.pdfIn PDF document text
    • http://gakmancreatures.ru/tomtom_xl_n14644_map_update4r379.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/13835701816.pdfIn PDF document text
    • http://dkmz2.club/zexesisakugaderumumuwozeefx4a.pdfIn PDF document text
    • http://kieverts.xyz/phoenix_10_news_livemmapi.pdfIn PDF document text
    • http://save50.pro/tiki_taka_soccer_apkpurekalye.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xisisowotupom.epizy.com/bbc_news_reporter_salary.pdfIn PDF document text
    • http://zufosigikirir.epizy.com/accounting_information_systems_11th_edition_bodnar_solutions.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/17199376905.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/9862532190.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5192 bytes
SHA-256: 49902d8aca593b9d34be1e149b04173124580b06cbccf1a74515ee31897cd5f9
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 10500 bytes
SHA-256: bbce2f961ed3064712678812c002062dd9658e64f0c7f436ce2e82d472775fe8

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