Malicious PDF — malware analysis report

Static analysis result for SHA-256 5751578de45f51dd…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 19:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 76464056419123716bd8de6403cf3ec2 SHA-1: 425ee8b15fa8511373c24c7cfbbecfe899537ed8 SHA-256: 5751578de45f51dd93d31a15ea5019aad17f4c2a0b6ab99081d4f1e374ae7085
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+use+resistance+trainer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5fd21c26df6b3.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuwisarov/i0fhez7/63025415009.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/22224310312.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/bgfVOif/29099815839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ff6b9cddff26.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/gjaifdl/varillas_de_radiestesia_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_602cdfef5620f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5ff3762ce4ebd.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/cwMx13N/doxojuwafuzixa.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/pioneer_avic-x930bt_reset_button.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/oCjdwhj/61302071129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_61230a5b40a043f6a23793cb2dd6916d.pdf?index=trueIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_8c2ef43caf5b4ea782d30d4d80a5c755.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_6b6212c206f748dfaa3c8364273f52e3.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_fd8afedc9d58464688c337bae9fdd576.pdf?index=trueIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_2a206c52cd3449239a321f87997b1063.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_e31baa037f4445f9854d9f2619050e52.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_e46439c7e5d846e189576ea42e43c402.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_e97d87afb9b64473bac9d4fb56f86684.pdf?index=trueIn 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_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 4812 bytes
SHA-256: 6172a0259a2f17d0a59b5952bfda98f42bd8f4dc8a72ce799c911fddde5eefdf
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 11104 bytes
SHA-256: 5019abbb6930547707fe83fab54f6bf066abbb953acd181a3d59b5a503fed03d

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