Malicious PDF — malware analysis report

Static analysis result for SHA-256 347aad330fecdbec…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 10:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4ea05703fa757d5ec1539aaaf998d8e SHA-1: b879edce60ba2c732965d03fc13d596880330864 SHA-256: 347aad330fecdbec5f28dd5b6357e237ae8eeb33ac22920eb5ef31f2c98340b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, suggests a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=free+v+bucks+no+human+verification PDF link annotation
    • http://satcomlink.com/userData/board/file/6395612470.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/jupubosu.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/44552732875.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/puxirowuwewafamelenariviz.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161376df67f383---zopuzuwizajubixixego.pdfIn PDF document text
    • https://electroagro.es/pub/files/4674330785.pdfIn PDF document text
    • http://netflor.pl/upload/File/62261550118.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/pejunegenekubusofisafado.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd22e47ca0---vudimosejazujazetuw.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/84880371777.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/85867610683.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb4d39b59---56426267738.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/913085632.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mawagawida.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jefigolafo.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/givatodupaketowa.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/68624605278.pdfIn PDF document text
    • https://hirurgija.me/files/15461464196.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/sijozidisuwuk.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/43775743300.pdfIn PDF document text
    • http://standardamulet.com/files/files/22625136492.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/23974419925.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_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 10928 bytes
SHA-256: 807fbc0afdb071fd6b18cb42231e177eb921a04e857d158e22816a14b9a991c0
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 17880 bytes
SHA-256: 079decb2e7d1bb02dd881c1a8d52f5125a26274c6e41aee450c515d29c1a56ee

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