Malicious PDF — malware analysis report

Static analysis result for SHA-256 352e318831c11713…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 13:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8be9d96c43c90e23fec064c6a80bf64 SHA-1: 728524c43238dab286b2dd9afa166f16caad28b1 SHA-256: 352e318831c11713c4fadabd9d08ac1e8168fd0db7426026d78a2cfcf34e7f29
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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://bologen.ru/strik?utm_term=what+level+is+curse+of+strahd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386593/normal_600f31ee98088.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/madek-pinekite.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/vekilup.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/luromatatuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_6015cd0ed6324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcaa0de72444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_6049ddd087c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_6044d872da5da.pdfIn PDF document text
    • https://parikijofema.weebly.com/uploads/1/3/1/3/131383717/bepafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_28203aceae614599980b70747a99aa90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/85845654144.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_a58309a3833742e48862e241935409a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/ximujagizazi.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_1a3cc285d00b4a0791cdb7b127386511.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/brtten_net_hesaplama_forml.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_e3b94afbd9e64c5b9404b4ac6b7c5eb0.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_04c7494e4f0642a4b1db851148a5893d.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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 5180 bytes
SHA-256: 5787aabe2f2658a01d83f6e52ba357191c73914d856d1e3608f951fc0fa3875d
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 11544 bytes
SHA-256: 445ebe88ae31e1f93f39e33e2207188314eaf44850ffc20bb923213b9564d58b

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