Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ed146e325100e0…

MALICIOUS

PDF

76.9 KB Created: 2021-06-04 10:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c5f8a9ef502ccc12e37ed0fbb26a397b SHA-1: f4511ee4a22611fe020e07c125d136a878ca86df SHA-256: 22ed146e325100e0610571eb9adad1d5a26c83911a0a6236094b9b1dd7617bbf
206 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam lure, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/pbw?utm_term=how+to+reset+zmodo+mini+wifi+camera PDF link annotation
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/07d2997.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/bunaweg_jefivarufi_xazexebuve_neburubepo.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/bubejiwixol.pdfIn PDF document text
    • https://jefibapo.weebly.com/uploads/1/3/2/7/132712451/xaworuzi-watobak-bisegexerusupeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6064538f711b7.pdfIn PDF document text
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/256872d874.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/2e50c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_60470015e5b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_602535a17b8a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385853/normal_5ff025c35d216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_601a73bb754d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a379f30-be77-466c-bb5f-3e578c3f0840/bully_scholarship_edition_patch_freezes_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee96fb7-5c46-4e9e-bfde-b1afb8a3dacc/36406209633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c87a7e-1ca0-4b93-89fc-18abd461216e/59251997711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9171ef1-1c54-46a4-b291-83428d926500/21621058153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819dbaf2-643f-4277-a970-1ac4c12717dd/mymathlab_free_access_code_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e850b87-a177-4a98-80fc-84124c8ec9e7/who_is_marjane_satrapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72df8ad8-020a-4bc8-bca3-d062388ce526/nudagemogelaf.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 5236 bytes
SHA-256: 9c7db903cd008042c741be08a16e6f08884b06d2712e643f54ac8464e7e23797
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10840 bytes
SHA-256: 296b705896fbd609151a988a526bafc62be1f893d9e93ed7cd94852c0f8ed447