Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa64f3db5c9e917f…

MALICIOUS

PDF

81.7 KB Created: 2021-03-24 18:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b234eab3bccd8cc2485f037cc51f8d99 SHA-1: b13786a6faf6297f0f02802a0041080d6b1da04f SHA-256: aa64f3db5c9e917f1e34e34ddfaf7e27beca4873634a456778aa59b22aa1b418
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=number+puzzles+brain+teasers+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390328/normal_600977e6a111f.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/xafixivutavuzonarulapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_604f97e0bb0ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_6003e42000e16.pdfIn PDF document text
    • http://tegonur.22web.org/natibuzajefuroni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_600bd6ffb3780.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/65452947675.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/marriage_counselling_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600f57ecacad4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunadupiliv.rf.gd/87210606219.pdfIn PDF document text
    • http://kowikipovugi.rf.gd/pathology_project_report.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_72eb33dbfb974d7897cc1194b8dbf5a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95045eab-3e74-4fdc-8ecb-9ed92c44b7fe/clasificacion_de_las_ramas_del_derecho_publico_y_privado.pdfIn PDF document text
    • http://webataj.epizy.com/27318114612.pdfIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_5222ded07ff74b0ab46fc5ca8cb3ff80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7797786b-0351-4ea2-bc14-7abb2ec9f6b5/pubad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2de470f-36d5-4315-9c01-435e7d12ea3b/33480817150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03ec8bd-8c2d-4028-8222-2c5989480564/21707969601.pdfIn PDF document text
    • http://reduxaxu.epizy.com/kesenedalodaz.pdfIn PDF document text
    • http://wasaxotudulolo.epizy.com/80692540005.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_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 5312 bytes
SHA-256: 9e5af87391d42809c1949f70d43d7b2f24bea7e90c6fe7423d719381db7a8afc
font_01_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 10632 bytes
SHA-256: da4e22eff0712a8cbdd26408802d783510e94a788990d77300b0dd4acd98994d

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