Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1daf8d3ea016c66…

MALICIOUS

PDF

76.1 KB Created: 2021-04-09 10:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2dc9303e1afea4833e211a921e19f0d3 SHA-1: 91dfa59ac286c1ac2e9184fbb152ef5b01977ff5 SHA-256: b1daf8d3ea016c661c8108f54336460152b021d99364e7c1ed0c6845942113f2
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, and one directly links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Bluetooth keyboard for ipad pro 11 2020', likely a phishing pretext to drive users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=bluetooth+keyboard+for+ipad+pro+11+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6013b12011a2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ffa0fba27ad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fd7b2beed791.pdfIn PDF document text
    • https://getawupib.weebly.com/uploads/1/3/1/8/131856556/keromovekegotuz.pdfIn PDF document text
    • http://servempieza.site/avery_personal_label_printer_9100_manual0cbcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_601b88f3ecc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_605d54fc74000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394071/normal_603997e53fc9d.pdfIn PDF document text
    • http://3bureaureport.info/gofefenefozaxovalmqu5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367952/normal_5feb927b7e70b.pdfIn PDF document text
    • https://nixozetite.weebly.com/uploads/1/3/0/8/130873825/7913840.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/ski_doo_repair_manual_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479707/normal_5ffcc756d3378.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/kezejuza.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/6479658.pdfIn PDF document text
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/bubilakofunepozanafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_274de7b83f154faeab7c772f576b8b1f.pdf?index=trueIn PDF document text
    • http://roporuti.onlinewebshop.net/8595858203.pdfIn PDF document text
    • http://fabevax.myartsonline.com/agenda_diaria_2020_para_imprimir_gratis.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_bc880c7f55a04b4ebd17e7a259cf3bf0.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_0a933f62fa414a4086f207740ba553e2.pdf?index=trueIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_cfe2f0f5d8a94f2bba730114a232b8b8.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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 5632 bytes
SHA-256: 913751e40635485c4499bbd931653adff2282c0d19e51a49479041bbeafa12ac
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 11100 bytes
SHA-256: 765e0af17576da8b0ac2c592ec95b97033d51d0e73e3bf469f5ab3ba4a58ab3c