Malicious PDF — malware analysis report

Static analysis result for SHA-256 db24aa68a601e365…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 20:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3d7ab20d92c64f6a08112df6d48bc37 SHA-1: 41e18c4486127ffae5d5814f3f5119e7c0a58931 SHA-256: db24aa68a601e3658a6d390a638a3ee61a4f7747b6d41e8ecf31477f8b935213
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, indicating a link farm designed to redirect users. The presence of external URIs and the link farm structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://studiocinti.eu/userfiles/files/kadevedasa.pdf In PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/88949571293.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/68257766652.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/devularepetirewofamizapi.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/87786935979.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/68773743843.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///guwejuzituratamavu.pdfIn PDF document text
    • http://okvin.org/userfiles/file/75620732116.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/59071900234.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/25463407473.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd7b29244---40570116664.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/70upll5vfd4pd4uh0bh28lnn24/dejumavekofabizepax.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911223624_3orgo3.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/bigaponetanizosiresubodo.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/52410707902.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/devunoregadil.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/29536117153.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/74073134797.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/dutuza.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/riditusezogebig.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/fudugometez.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/veguxe.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/kagexoloxaradofabidisoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=flashlight+for+android+apkPDF 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 17940 bytes
SHA-256: 5ecaf4b66a3d40d1b78e6320b16ba30620e1713c98008c7b25b1de972030c538
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 10712 bytes
SHA-256: 84727b72feaa6ebc896a0408f51ad9506f67a73c1809eb94d87b05fd4bfb6df7

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