Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb4e8e06911da08…

MALICIOUS

PDF

78.2 KB Created: 2021-03-04 22:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 96ab780a174e01b43093b7bdbd909def SHA-1: 15415b872c0aadf5d04cc052717a3dddd4e37aef SHA-256: 7bb4e8e06911da08ad3ae3587cfcc747237fd2c037a0201b8cd200dddfa133f3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://lozipotod.ru/aws?utm_term=built+to+last+grateful+dead PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489412/normal_60414064bef59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60300a8ca551a.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/93248649642.pdfIn PDF document text
    • http://adanakebap.org/expanding_brain_templatevniww.pdfIn PDF document text
    • http://hookup754.fun/bekopawurel9aivf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6018d935396f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_5fd8157265450.pdfIn PDF document text
    • http://aires.fun/junajogijiwotiganametekf9tdt.pdfIn PDF document text
    • http://konolux.medianewsonline.com/lodge_cast_iron_recipes_pork_chops.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_601da64299a0f.pdfIn PDF document text
    • http://stavki.link/70023981462ex367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5fdd383da6890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fde5fb861ba9.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/sherlock_holmes_novel_collection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_603d928a2779a.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/aa747b6a-fffa-4a19-9903-edde7199d6a7/70409314886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e7f0ff-9d3e-4452-a091-cc1d6498edc5/guberesuwowufex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a315c4-96a5-40af-a913-546b33317e93/project_management_professional_pmp_certification_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae3e359-dc96-401a-b788-faae83c33a69/tu_mundo_1st_edition_access_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a737ced5-3709-4d59-8d6b-67373a92a64d/12095304500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d235a421-8f2b-4906-854f-6e6c7d150356/texas_instruments_ti-83_vs_84.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ae36a1-d4c1-401f-936b-b309439f4b1d/84640985811.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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5124 bytes
SHA-256: 347b68d161e9dfbb20f317fd707580340cbd4674b25c4f1ab0ec66c8db703ed7
font_01_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 14008 bytes
SHA-256: 8461c712c7d1b4e976b14c61b380504371be47e45c95c91c7650e7da1f45830c

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