Malicious PDF — malware analysis report

Static analysis result for SHA-256 230d66b4d1546b27…

MALICIOUS

PDF

82.9 KB Created: 2021-02-13 11:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 137d5105a840e96477ba24e19691f0a6 SHA-1: ed68f25a24a0a23a5377485f649cc96f32ecc530 SHA-256: 230d66b4d1546b2764a657c9fb8d47210adac434c76449ba19ce04d560538002
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution intent. The presence of numerous links on disposable hosting further supports this, indicating an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=interpreting+information+in+a+pedigree+chapter+6+answers In PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/pogirarikug.pdfIn PDF document text
    • http://50off.pro/sekujijeribexarehm1xw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_601df9c7a4459.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/Pgerxjc/15218831889.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/Z1GkBuB/telepsychiatry_services_in_nc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5ffbc4b9cb2e4.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/hcmicgj/leguvazixed.pdfIn PDF document text
    • http://haifaiv.ru/nebijowiborakxib50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_601ceeaeb4cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fd13975b07be.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/9252733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_5ff06dd6e38dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_6001f52675cfb.pdfIn PDF document text
    • http://tonerinkstore.com/50812526068glhzb.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/hhf7Ior/retro_arcade_games_machine.pdfIn PDF document text
    • https://xudarusutovupaf.weebly.com/uploads/1/3/0/8/130814591/sogipunapabut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_5fd81af409cea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff04c2cdac0d.pdfIn PDF document text
    • http://moperala.iblogger.org/vujuna.pdfIn PDF document text
    • http://i12tws.website/chrome_for_windows_xp_offline_installerp0wwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todizegi.epizy.com/19695432376.pdfIn PDF document text
    • http://zukavinu.rf.gd/wia_canoscan_lide_110_software_free.pdfIn PDF document text
    • http://talaxevavilur.rf.gd/navy_football_uniforms_vs_army.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_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 5720 bytes
SHA-256: 581dbe90aedeafa74882441bccd24710421f22fb73f995a7f9cb46b08b67eb02
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 10472 bytes
SHA-256: e4f5405654827f20c73f734163fdc8b66aad1392f8b4d8b07c96f6a9c0fa14d7

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