Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5729480550dc5c1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 16:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5637e42c82f9d94a5429f0c7eb4058f SHA-1: 3d5057891d79ad35066aa05b171be17a33038601 SHA-256: f5729480550dc5c137e43bb2976785a80ef5f0d44577dd3abf22571cc6fc0bed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the PDF_URI heuristic points to external URLs, and the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46165982951.pdf In PDF document text
    • https://costabravas.com/uploads/localidades/files/76815274835.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/81861425305.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/36297502826.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/47680448200.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/tovekora.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/peperenupasupiximazosa.pdfIn PDF document text
    • http://topflexsports.com/uploads/fajesare.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5c329324---59343847690.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/51061502631.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/kenotesasuvijafavuxixog.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xajadagatixumewadeven.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/wiwuvumivobeg.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c15a7ff5---lapojuzuxoli.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/89807248161.pdfIn PDF document text
    • https://baptistfriends.org/media/34037526323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+currency+on+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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 17644 bytes
SHA-256: 62dd9a55a4ce28f693a0a218409609e28d1ee07f5f75aa0bbd473c34b260f488
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 10724 bytes
SHA-256: 956aac26c37ff0e22212d21116e83830df6ca105c1c90a9fce8bc899c8d660fa

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