Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeafb7f5fe67fb87…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 16:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d1a36e78024b4057b2d3409e4703d182 SHA-1: 6fc1188d484a3bd3fbee40b65ac80f7fc698f663 SHA-256: eeafb7f5fe67fb87b51c9b0648674424e15b3de9ea8fb2148bd4d3335aaedad6
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 pointing to disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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/award?keyword=dfa+passport+application+form+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60264ef433f6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fc8eb6f319df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5fe2a630b89ad.pdfIn PDF document text
    • http://kekasot.22web.org/33727354443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff7780148eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452865/normal_6009d6a0e21b4.pdfIn PDF document text
    • http://kagiburof.iblogger.org/administracion_de_medicamentos_via_intravenosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6037c5ea0a374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6037e278309b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_6016c364ebe18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_603b13227ea15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_1043b62a47904112b0c6a506f8811e97.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_5fb49a6768ef4b32b405703b78b442cc.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_567a039d98c1454faa8100e17650b791.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_12be8aef810b49b2b639bd065bbbfde9.pdf?index=trueIn PDF document text
    • http://julepudelixi.rf.gd/achieve3000_article_answers_2019.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_2e4ec1b380ca477683da21785f12a6c8.pdf?index=trueIn PDF document text
    • http://bevonox.epizy.com/dejiwekoduja.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_b7cdecb8b3ef4c60b9baf66536e7984e.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_6ad9a33436ac442b8253c1dfef537fab.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 5572 bytes
SHA-256: efe0120b73d4c7427885b235a36bfd98c311872a62a570eb87a6b271df5ec805
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10512 bytes
SHA-256: c0e5427cf2d891f0fce3e03630a03da9bb757413be1a49ad8887476336802a9d