Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a48608144ff95da…

MALICIOUS

PDF

70.7 KB Created: 2021-03-16 22:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8624b0e5e5c988621821b8e71b946d42 SHA-1: 775d9622a01ca0606bf0164578b80907c9b4dad5 SHA-256: 9a48608144ff95daa706fa8f174f20a276b45710deaa8241e6fcbb0165a5a058
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=write+algebraic+expressions+lesson+7.+3+pdf
    • https://static.s123-cdn-static.com/uploads/4411700/normal_600131c5e25c2.pdf
    • http://kabomodom.iblogger.org/gusurolefike.pdf
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/840ee67.pdf
    • https://cdn-cms.f-static.net/uploads/4421352/normal_6041c4b7c0d1b.pdf
    • http://lazimixaze.iblogger.org/61521460815.pdf
    • https://gunajotigur.weebly.com/uploads/1/3/4/7/134738866/xejotam-nuzepelo-kewidiwixoje-durijudufe.pdf
    • https://resezavurafufok.weebly.com/uploads/1/3/1/4/131407395/fagedovilimag-pibalexo-nedenesujobux-kiliruno.pdf
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5fe6a28415a80.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/2029930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bamasagure.epizy.com/22356955647.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_b6b9417bb02a43b387433d9364aea150.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_9d01bfbe63f746afa990b33547f14b73.pdf?index=true
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_3bebc402acf54ecb87a3e850aaa60718.pdf?index=true
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_a075c0a13f8746ab975f7e2e68ee4d06.pdf?index=true
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_53fd519f2da34deeab57aae36d0e22ba.pdf?index=true
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_c7fa84751427489b86f47fc3594c8f47.pdf?index=true
    • 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_off0000d41e.bin
b479c505724a0ba392b1b0961fea3498eb72cc03258504ec400fa357953b1f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 5820 bytes
font_01_sfnt_off0000e817.bin
5ec7b94884ea69004ef3e6bc7da3c673430c046ef480a198d0bdf52890435036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10952 bytes

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