Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f62a904cf1fc561…

MALICIOUS

PDF

78.1 KB Created: 2021-05-26 22:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7e4dbb763133ac690c6f29b9c6f618e4 SHA-1: 25888c069e5326175a1ec0edc567289f7cfd5aa1 SHA-256: 4f62a904cf1fc561e1be4c89e05fd2a5a1d1cb731c28f34a2d0edb2db0d3969a
206 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://gimoguvi.ru/strik?utm_term=how+to+get+financial+assistance+for+a+funeral', indicates a lure related to funeral financial assistance, likely directing users to a scam or phishing site. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gimoguvi.ru/strik?utm_term=how+to+get+financial+assistance+for+a+funeral PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374021/normal_600cb92d945c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_60660486833a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_600a49367d573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_6022107d0461f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_604e6cb9eb078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_6067da6853dd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5ff5c70a90f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fd95b3d87743.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/78ec6bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_5fdc2df7824b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_601ed13f16dd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_6004f30cbc0cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_5fd6763a2d4ef.pdfIn PDF document text
    • https://visegiwizokin.weebly.com/uploads/1/3/4/7/134721612/e9bbeaef8e7d0e1.pdfIn PDF document text
    • https://lonufiwinejuf.weebly.com/uploads/1/3/0/7/130776555/bejefupi.pdfIn PDF document text
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/vekajavuf.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/1892889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_604de07320926.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/d6746865-dfe0-44a7-94d0-c64996b06e6c/choc_and_tan_mini_dachshund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff78ea5a-1290-4dde-acad-64958f8f7096/nenotiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ae7793-d756-44ce-bb6b-9e2592849280/43538997519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/961c0588-a122-4f1a-aec1-e2d856c5949b/black_diamond_revolt_rechargeable_headlamp_manual.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5104 bytes
SHA-256: baef6a019020fcd217b630b14896e201969c88868cc9db06eb7bd444e4ddb1e1
font_01_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10968 bytes
SHA-256: 4a90772c2902cc6e1cc23a3ca70189a67ff07bffba19b30cfe0c27c2427c20a8