Malicious PDF — malware analysis report

Static analysis result for SHA-256 c561b85ac7f0fd53…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 23:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d5f9c4d04aac40029019d1641760b35f SHA-1: 24affc521ac4d86a51afe60e2cab739615116f86 SHA-256: c561b85ac7f0fd536a390d3f7da16aeb30fd1184822173a38edbb54877b342fe
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of multiple external links, including one pointing to 'soxebez.ru', suggests an attempt to redirect users to potentially harmful 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://soxebez.ru/award?keyword=canticos+de+alabanza+a+jehova+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5fca925e1be75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_601702284807c.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/lokuvemud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_601a9ade8c2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_60297adc10fe6.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/55879752866.pdfIn PDF document text
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/wukewuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_5ff3e98db7cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_6032935cb7cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fdbe07ed5742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fd2a918dd6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6014e24111eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_60433f0a35ce9.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/zalesonagex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_605815edc8420.pdfIn PDF document text
    • https://rataputi.weebly.com/uploads/1/3/1/4/131407353/vuzuwanogefifux-wiwowowuxuwepox.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/zaduxu.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/nisoxow/hakone_ryokan_japan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/20677349054.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/adorno_minima_moralia_italiano.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_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 5376 bytes
SHA-256: 5b62740e56bd0bbf32149320ac4acb8e24034521fa1927e1d8a268035691f063
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 11844 bytes
SHA-256: bf4bba0b66296dcbc291df0441593e9d547d43f21aaed647bda5859400b14e74

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