Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb3f837f6cf67b5…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 10:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f52d352ad868419946f05d3d47297deb SHA-1: 25bbb5bb4e6501e500033e65f58a351484c9e6e1 SHA-256: 6cb3f837f6cf67b5c305adfb62b3148e28760f15ebc48b17e2a36f95289b2d3d
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/wix?keyword=hacking+exposed+7+filetype+pdf PDF link annotation
    • https://bejobofilu.weebly.com/uploads/1/3/0/8/130814531/xovozebo.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/mubakigapelefit.pdfIn PDF document text
    • http://potolkilife.ru/masavewadeo7xzp.pdfIn PDF document text
    • http://eurostore.info/armourers_workshop_guide4l91i.pdfIn PDF document text
    • http://segwaywheelchair.ru/nomikadoxod7m06.pdfIn PDF document text
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/kubop.pdfIn PDF document text
    • https://vagibize.weebly.com/uploads/1/3/4/6/134618654/45527131cd41d.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/0wGgjha/53216304859.pdfIn PDF document text
    • http://persequenteamsohbet.com/kenmore_elite_upright_vacuum_hepa_filteryuink.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/R8aigPS/68755357038.pdfIn PDF document text
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/boxugelajeluvemudom.pdfIn PDF document text
    • http://pagebake.com/diablo_2_release_datecabdt.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/hfgeghj/wujasojab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/7695071958.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_e5333515995d47b2862a3acbe88c25e3.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_45f10a20a42341d2914b64d12dc09abd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/linksys_ea6400_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a22df7b-bfa9-4acb-a9ea-df6813001c62/bogexupes.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_eb6a7a6886c147ed844f07308b3ec948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0830fbad-4a14-4441-9abe-ca5a4c7aa5b9/google_translate_chinese_characters_not_showing.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/93839240524.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 5504 bytes
SHA-256: 20340df25cae8406abbd13734d90ec6d5a6c36a29fc39033fdd38ad3e990aa1f
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11120 bytes
SHA-256: 42278fa174c261151113140e124d42ae2495906d3529a5dae34b47da956ee9df

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