Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fd4d57ed8e3acd…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 11:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f8f94616a235f922fcbf91475408dea SHA-1: 5a0aeae77db4dfd2cbfda697d36d7a3652f79b82 SHA-256: e5fd4d57ed8e3acdc8f6c50c0f4f5d12b4ddb58c185d8ff32835aa841f0c3bef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards the exploitation of user trust to redirect them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=iphone+6+lock+screen+bypass PDF link annotation
    • https://vivaldiroberto.com/img/files/mediafiles/file/basegiga.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/paleweruwisizutigukabufis.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/tasakedifuwojiz.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/81426892039.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/jujaganowiwezikagemozugog.pdfIn PDF document text
    • http://cl-pub.com/files/files/63243939551.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161419f73bd4ee---46186060875.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/20654782126139c3e402737.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/19465078099.pdfIn PDF document text
    • http://cartopack.be/Images/file/farinusoba.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/zifagekumisowudox.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/17159671120.pdfIn PDF document text
    • http://yepuco.com/uploads/files/jodejotigizuperijozo.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/kalixije.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/85737281450.pdfIn PDF document text
    • https://everestart.com/images/stories/file/10044221773.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/43979919113.pdfIn PDF document text
    • http://12shio5.com/contents/files/xuwajibepuv.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/34506568116.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/1302672923.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/8557348333.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/fojusitixufomuwer.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412e16ee406---mowatujibokivaxema.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 16768 bytes
SHA-256: a874faa8ef168ae27c9df6c07bc5b97227ef3c8382fed4b58cc9362e0f055fa6
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 10744 bytes
SHA-256: 71e14425b860327d0837a273101320b8f0273c2a89aa20939c6cf3f55f5815e0

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