Malicious PDF — malware analysis report

Static analysis result for SHA-256 192b609efaa9e661…

MALICIOUS

PDF

71.3 KB Created: 2021-02-19 13:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4eb97409a2261451d2717738b87c71d5 SHA-1: 6cdbb9876080196ce4407790d70403d8c64531c5 SHA-256: 192b609efaa9e6614d3281825f2fbd28e20fe9b0becf0d347c699e52ce8ebc3d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://baarspo.ru/strik?utm_term=integral+of+cscx PDF link annotation
    • https://lojodisomu.weebly.com/uploads/1/3/4/0/134042672/manuxepufore_pomodufuze_tiwofalifodu_botutigojulidat.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/R2bhdYB/domizudetudese.pdfIn PDF document text
    • http://domsale.xyz/2604426338ek3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_60257e6d7d784.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/zafafuloxosuruvipa.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/26370296517jle62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_6008a7de445d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fe3225331c93.pdfIn PDF document text
    • http://bathforlegs.xyz/6550193817rxx9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_5fe70ab7bc251.pdfIn PDF document text
    • http://andyhong.blog/75362571436dxfe7.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/6376706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://povuputuk.epizy.com/23205866005.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/95299332188.pdfIn PDF document text
    • http://depolavebusep.rf.gd/fractions_worksheets_grade_4_with_answers.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FD 4792 bytes
SHA-256: 7b970c8fbdfecd90ccdf1cd0887f77f61cc2a23a7167cf60b3287ac7bfd0394d
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10056 bytes
SHA-256: 901936cb997534f1a21329ea3e2ed05cbea1c3954057ea6bfef1b66213665cc9
font_03_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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