Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25e9f38d2005fe9…

MALICIOUS

PDF

156.0 KB Created: 2021-03-08 04:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0370f48bd01488f96b99a86eb0906aa0 SHA-1: a494ffe8bf24d6214c0a18313224812e62644617 SHA-256: d25e9f38d2005fe982141734d3333d7f711a48dd4500a125d3b4ad83638dbe4b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to '1 through 100 in spanish chart' and application metadata, suggesting a lure document.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/aws?utm_term=1+through+100+in+spanish+chart In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370294/normal_5fccf271198a1.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/memifabewanilurada.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/6756c0e1d3725e.pdfIn PDF document text
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/1909629.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/wamevulotekoxo-zitage-xomusekito.pdfIn PDF document text
    • http://ledy66.net/loviwegikikuzaruf8fxk.pdfIn PDF document text
    • http://beach-fruit.fun/biodegradable_polymers_bookdo699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_6026763c5c5d8.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/ed5f617f08b475.pdfIn PDF document text
    • http://vinorama.fun/yeezy_500_utility_black_release_date_2020wh4on.pdfIn PDF document text
    • http://table-wait.com/hochschild_arlie_russell_the_managed_heart_commercialization_of_human_feelingn24q5.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/wofiperu.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/30201970153.pdfIn PDF document text
    • http://feyakast.online/ninja_turtles_mens_flip_flopsklfxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuguzametekobo.myartsonline.com/batalogukavaravu.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/lanolivibulewi.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/alps_syndrome.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/94606459754.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/51104355814.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_off00022510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22510 5264 bytes
SHA-256: efb92ab1510f9d921bf9b8a547c3fa195910f46c48f53f9a7399ea0194005f31
font_01_sfnt_off000236f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236F4 14320 bytes
SHA-256: 32970a8ef107807bace515e806780dd8c7bf4b5e01629bd1625c5ca172f331cf

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