Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea37eea97dc46e8…

MALICIOUS

PDF

75.2 KB Created: 2021-05-20 03:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0095bdb594f9aa56630492fa7b0c252e SHA-1: da32a2381da586d6c00750f567221b1c8ebcb0e5 SHA-256: aea37eea97dc46e8f0bbb426a893c8bd0c2e8dc31d31f4764a2ac5c661a76893
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites under the guise of providing free sheet music. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to drive traffic to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/wb?keyword=blackbird%20beatles%20piano%20sheet%20music%20free PDF link annotation
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/6132390.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/9c4ed9569.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/da87e580ba.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/zobekumibidegokaxoxe.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/1094506.pdfIn PDF document text
    • https://lopenedaxi.weebly.com/uploads/1/3/1/6/131606218/2e162da00.pdfIn PDF document text
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/funexivol-mulexabim-tigemuki.pdfIn PDF document text
    • https://ripumunilemaz.weebly.com/uploads/1/3/5/3/135302863/f659fa00e.pdfIn PDF document text
    • https://xakelagus.weebly.com/uploads/1/3/3/9/133997825/b7164b.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/rorupuwefa-lidulosixu-vabemobuvuwixi.pdfIn PDF document text
    • https://kitetunevoneg.weebly.com/uploads/1/3/4/7/134703129/4248758.pdfIn PDF document text
    • https://tebuzanowazori.weebly.com/uploads/1/3/4/6/134632783/fbf619.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/2905386.pdfIn PDF document text
    • https://pekeweluxema.weebly.com/uploads/1/3/5/3/135304067/gobolujeg_vowetiluko.pdfIn PDF document text
    • https://likomajuf.weebly.com/uploads/1/3/5/3/135321460/64c7609a6de62.pdfIn PDF document text
    • https://muvavibati.weebly.com/uploads/1/3/4/6/134669950/503d8.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/7080664.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/vurafubukata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xefejevife/zefapifoludaxidipematow.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/54834307928.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/kawixupo.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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 5648 bytes
SHA-256: 6497a2cf5b85c49e6843a473a6f9f8bda4841582bbcea0588636dcdd1be5429c
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11100 bytes
SHA-256: 8ef03644a0fa7f8c957036d8ca6f3c675d41c1bedbab075ea73e6d07fb8e5a51

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