Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecae1b4d889c57f7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 739cb1b0b3dea25f80da81ddc9714507 SHA-1: bf6bf68151f03410443d4762a1f416f0c8ee8d96 SHA-256: ecae1b4d889c57f7341dbf5754e046fbb97aa25f24cc0bed5a81726f3db819d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm heuristic strongly supports a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sapsda.org/SapmaUserfiles/file/wiwikomepopugovodozas.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/98578280158.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/xusajetafukijibetax.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315bd9e1244---56712076250.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/repafopukemuzija.pdfIn PDF document text
    • http://mastervin.ru/files/file/5470420139.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/ludabesatikodox.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/90130104549.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/votiferojuninoruwi.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/70820073181.pdfIn PDF document text
    • http://asid.rw/userfiles/file/6757966144.pdfIn PDF document text
    • http://showdoimovel.com/files/files/kuxojupen.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/42897702994.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/60928625520.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/boxodol.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rovinemixenuxip.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/39999727466.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/63810190389.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/91911522505.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021972132464722.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pilelix.pdfIn PDF document text
    • https://netpage.info/userfiles/file/34964982021.pdfIn PDF document text
    • http://allycatering.com/userfiles/18703528099.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cf75a92e32d48f0359cd7d6cfa8327a4/83067227760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=musically+old+version+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_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 17496 bytes
SHA-256: 43bd1b48246666fba08c66f3daeadb75d7d55274c436f6a15983e5614a9d0e51
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 10776 bytes
SHA-256: 951b680b65277bbeb58fb208dab7fa2b2ee55569ebaf9fe55518f3400ad0a919

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