Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bebc3b487052e3…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 09:10:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 491b6c5b6210b7f4154a519da23a21b3 SHA-1: 472d02410226e79450532d9c114e2515dbfafbb9 SHA-256: 64bebc3b487052e35642dbd1dc79839bf1299550c2dfd673357ec820c00e72ab
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/award?keyword=angiografia+cerebral+procedimiento+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366028/normal_602708285054d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60275e86cd5c3.pdfIn PDF document text
    • http://meetsoda.club/9059454411390q61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_602dcc4b587a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_601ad343c3905.pdfIn PDF document text
    • https://monivewuvafa.weebly.com/uploads/1/3/4/0/134096064/c5b5f0a14.pdfIn PDF document text
    • http://matrixbicycles.com/free_pharmacy_pocket_guideejd7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd9936472a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_601a4c19efaf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_6046e7c5783dc.pdfIn PDF document text
    • http://1xbet-football.fun/lufupofrx7w8.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/xewazan_ladobofibesut_jufifufoburi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fdbb557716fc.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/3b9fc7ba0e.pdfIn PDF document text
    • http://new-volosi.ru/241390370565x4ux.pdfIn PDF document text
    • https://xamodeximafu.weebly.com/uploads/1/3/2/6/132681508/382483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451556/normal_6026552e10475.pdfIn PDF document text
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/2c6011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5feec6c275a56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_996c0d51144d46ce82779bfcebca7f17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b32f168-9299-4f41-ada7-dde7d9c1ef97/best_python_data_analysis_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a78052-18c7-4e33-855a-2183b11ba952/fovenodurotize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0dd16b-f432-474d-aa99-b30db55b1556/purifuporabe.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_29d78a72fb1640c4b0414d1f8556770d.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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 5428 bytes
SHA-256: f0986e82deb0613ca5d75f679391cfba9d6435668f7b4ffa46bcf37a1fe7202a
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 11204 bytes
SHA-256: 39ea03be58b6e09875185f1c661f559f3cc9443c7f95b53eff5427c3e58d1402