Malicious PDF — malware analysis report

Static analysis result for SHA-256 2454d32ae645571f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 02:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2d5826535460fa52ba4efb5dd5b0aa5 SHA-1: 0271ff6af738ade4717e3912f63cd8c73eb48863 SHA-256: 2454d32ae645571ff62fa8d0d0a0ed421238607f4fa7f4240fd9a857f4b2fb77
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=note+10+not+charging PDF link annotation
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/nifadepabaziwaruvime.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/41735352750.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/pokinomimadak.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/57788118232.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/tatav.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/feloduv.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/34916105753.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/venonevebijepebukufukiwip.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/79803029981.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910040214.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/52464565147.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/towugogo.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/71878066753.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/36878184735.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/10489433960.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/redapusutebenoxoses.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/33571196984.pdfIn PDF document text
    • http://unseretochter.ch/images/file/divimeverof.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/70948211089.pdfIn PDF document text
    • https://birotex.rs/images/files/86245782140.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210905_0_34_25.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/raxinejur.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_off0000bad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 17072 bytes
SHA-256: 1c153f1dc66dd660f9ef16cfe536e64f3b47db4e09bfd3c9bd791783036a29e8
font_01_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10444 bytes
SHA-256: f52ec08804698d06bdc418a702b5690164f4f2ae85b0f6e044be30a68448ebc7
font_02_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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