Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b4c00c91e4bc90…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 00:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 080fffc0e3e4921defc4e898c316f5bb SHA-1: 85add8f89f914c90f191c6ea4056dbe57d8d11d3 SHA-256: e8b4c00c91e4bc90d850082f826ccb52ab533d5ce0f43b3a787b06eda368539f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous distinct, disposable domains hosting PDF files suggests a link farm designed to obscure the ultimate destination, likely a phishing site or malware download. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dalnoboy.com/data/filestorage/upload/files/68735673782.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/tawemejalujaxoxokebizoxap.pdfIn PDF document text
    • http://attlas.center/userfiles/file/mipozibo.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/84999932892.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/99235180377.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/9407555958.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/64753180654.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/6451609253.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/52823598905.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/70926517009.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/pebadajelo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161413ae77b282---14515117525.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31a25177a---73202284787.pdfIn PDF document text
    • https://kimcert.net/E/file/75174949204.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/10054149444.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/rameliwunujokogutalu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/73956947872.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/4642456792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=alexa+app+apk+for+androidPDF 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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10400 bytes
SHA-256: 8628ca88bb08e350e1f15b434c0a6d01d9b1259f7345e3e8ac611332615fc9a8
font_02_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 17560 bytes
SHA-256: b12ca3b5927c69d656ce1028645b6e2fefc779677da19ccd0579de0223619750

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