Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eb59a210d899b5…

MALICIOUS

PDF

79.3 KB Created: 2021-05-20 06:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32edf845bfb11b2da7da20a2e55edc91 SHA-1: aea1dea6e6d812eda48f2c72eef358aec297a3fa SHA-256: c5eb59a210d899b5976137951ab057608d9b92f70f230ecda822cecfc8e6c59a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files hosted on Weebly and other services, suggesting a link farm or a method to distribute further malicious content. The primary URL, https://kuzutuzo.ru/strik, appears to be part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/strik?utm_term=digimon+card+game+value
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/b6ee9c0955403.pdf
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/jafofu.pdf
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc9eb852b27f.pdf
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/b5ecb14bf3eb3ba.pdf
    • https://cdn-cms.f-static.net/uploads/4369149/normal_60326c4185fc2.pdf
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/vijafaxobaxujeju.pdf
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fe240e8484a6.pdf
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/sinakupexesix.pdf
    • https://rupanusevufow.weebly.com/uploads/1/3/1/3/131380126/4516674.pdf
    • https://cdn-cms.f-static.net/uploads/4469128/normal_6063bf0eec4b2.pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_605245f62492b.pdf
    • https://static.s123-cdn-static.com/uploads/4506131/normal_5fe464b18aa92.pdf
    • https://cdn-cms.f-static.net/uploads/4447663/normal_601c87d383dff.pdf
    • https://static.s123-cdn-static.com/uploads/4410447/normal_5ff3b82b27fb2.pdf
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/sesobetumexe.pdf
    • https://static.s123-cdn-static.com/uploads/4469128/normal_60085d82163ba.pdf
    • https://cdn-cms.f-static.net/uploads/4492529/normal_603e648514965.pdf
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/dulirogafomabab-woxuwuruxupu-godubuwuxutufus.pdf
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/rutav_torudopuwaveb.pdf
    • https://static.s123-cdn-static.com/uploads/4369173/normal_5fe504cbb0250.pdf
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/6cf1d3596b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7e.bin
44b9a161e4b69c4af37b7226672a43abdec21da409b1fc57aadbddb31cba7051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 5140 bytes
font_01_sfnt_off00010bf0.bin
1721205a9d12d2ccc546eff335c193279c7518d13be3d351a7cf709361734012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 10608 bytes

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