Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3539bbecb9c7c9…

MALICIOUS

PDF

74.6 KB Created: 2021-06-03 15:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac921cef89b96ad427f83a9d34b2f96 SHA-1: fb883cc67fc2ff772a4d1f9f24622740e2515c56 SHA-256: dd3539bbecb9c7c969359fb8e3e3c5067c9b987254e161dc677e599409b422b3
184 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8641

Heuristics 5

  • 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.
  • 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
  • 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://pistant.ru/pbw?utm_term=como+calcular+el+numero+de+protones+y+neutrones+de+un+elemento
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/mabuvamasimi_lewedosawa.pdf
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fc8fa171ab43.pdf
    • https://vilawapa.weebly.com/uploads/1/3/2/7/132740366/teretimerevajux.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/4317252.pdf
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/sawepi-vagipulurexo-jemagaxa.pdf
    • https://rizamarorupewug.weebly.com/uploads/1/3/4/5/134527102/963496.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_600a6072e2e1f.pdf
    • https://tajolakafu.weebly.com/uploads/1/3/1/4/131454466/2609229.pdf
    • https://cdn-cms.f-static.net/uploads/4447465/normal_60462c05c8c56.pdf
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/7020590.pdf
    • https://vamexerop.weebly.com/uploads/1/3/6/0/136085595/folamog_suruxebuki.pdf
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/30aca9d2.pdf
    • https://degugelusejife.weebly.com/uploads/1/3/2/6/132695568/wiromesa.pdf
    • https://static.s123-cdn-static.com/uploads/4456369/normal_5fee676f4a9dc.pdf
    • https://cdn-cms.f-static.net/uploads/4480899/normal_601df83d8fac2.pdf
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/4b1385c32e7.pdf
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/voguxurasakisuwoj.pdf
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/a65cb9bbe6a.pdf
    • https://cdn-cms.f-static.net/uploads/4366339/normal_601d5b537b323.pdf
    • https://tasidumil.weebly.com/uploads/1/3/2/6/132680907/tukerexesotudewijok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://magogopowo.pbworks.com/w/file/fetch/144476124/53192797751.pdf
    • http://lakebimutep.pbworks.com/f/property_management_agreement_form.pdf
    • http://degenazi.pbworks.com/w/file/fetch/144455934/17976673455.pdf
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144471018/download_cheat_gta_san_andreas_android_no_root.pdf
    • http://lulatigono.pbworks.com/w/file/fetch/144535836/lego_dimensions_back_to_the_future_delorean_instructions.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae8.bin
d72f75cc1cff110c72a9ae6bbb56c9a5fb39b82b8781e06a3071ce5c2e1a9e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5176 bytes
font_01_sfnt_off0000fc68.bin
a27f4fbf87edf4d4e1cc14e9bc1f800130400f11e20e957f05803017bef468a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 12052 bytes