Malicious PDF — malware analysis report

Static analysis result for SHA-256 5868fd64decd028b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 08:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1ae333e5bc55e20b2f7543e3b52b087 SHA-1: 87201f5f08859b6b8c89dbae3362c57efb6fda18 SHA-256: 5868fd64decd028b29a920ce94f7ec10fc530053168ace8b4f0a26f039cebea2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded links pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination and potentially download further malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/wimogudebatije.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356eac0657c---gasaj.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/55912988764.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/68655839896.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tisag.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/16715180613.pdfIn PDF document text
    • http://feminella.ro/upload/fck/zerokifajaru.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/fojitesurifoza.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fexetajuwozibatu.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fumelapakudaloroninez.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/zelosezobolowo.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/821828653.pdfIn PDF document text
    • https://clubon.top/uploads/files/perosifuse.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/kemafazaratedonuvitafure.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/lejegokazoloko.pdfIn PDF document text
    • http://bastola.org/userfiles/file/jilivonabotijugakazuwobux.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/muleponi.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/66310981123.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909132439.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061007.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/96069746004.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gajizozube.pdfIn PDF document text
    • http://sjhtractor.com/d/files/mupapulopisivo.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/roferaxapurabotetipofed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=items+that+begin+with+hPDF 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_off0000c1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 10468 bytes
SHA-256: d1c25f1749224cc0599b1dc6fa10ab248651a28d005358505136b9032a997375
font_01_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 19272 bytes
SHA-256: f8218ff56f644c4b94f5787ffe55bb878e26c00623fc43d1f61a6853fadc669c
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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