Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e00821257f91c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 11:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c7a565b8cc3f5de2cb7601f845c7d75 SHA-1: d7f44ea58fcfb66ca1ce361b30eb0a7cc71026dd SHA-256: 3f3e00821257f91ca44fb1bfa8c0dd6a76722516c96c700ec105099eb7ba08a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous embedded URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to host and distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://jinsonmetal.com/Upload/file/436510864.pdf In PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/pagarigamikinevunuzubija.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fuxomuxevivinidefagiro.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134875b67dc9---romagelodililipupumo.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/1672278438.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/56705336591.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bawogipuxibirobizemav.pdfIn PDF document text
    • https://rajakedua.com/contents/files/80641861846.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/64116328341.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/motavine.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/tarewosiwamumigemoraxele.pdfIn PDF document text
    • https://mikludava.lt/images/files/xumoluw.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/fowugonozikamem.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/nujixejoginoxuzeruvivoj.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/nogekezogufaxaxinegokabam.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/19130780347.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/87517843363.pdfIn PDF document text
    • http://horvathortho.hu/tmp/norito.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/rufek.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4ffaee99c206c7f23891ed5be729e1fa/sumoladapapovipotumuj.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lemegutazu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xosagekatafebariborakeso.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/52096128258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+history+of+the+hobbit+pdfPDF link annotation
    • 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_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 16364 bytes
SHA-256: c62d7b58849df906c827b6802ff81caec5b2bdde3a2b5ebfd80a3b2d0b5bd4a0
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 10500 bytes
SHA-256: 14af534875ae00a4ab8b69e134c727a146964d6670065cf774b860a9e63da958
font_02_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1