Malicious PDF — malware analysis report

Static analysis result for SHA-256 407aa914905bd264…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 23:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2ddb19bb3a2c0d7d67f4e882fbd92de SHA-1: 2119441f2a7e0edaaeea26b65f20b04643da6178 SHA-256: 407aa914905bd2642570b812bec3e8dac32a79e2541f029eee45b0699c6c27a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=apk+live+stream PDF link annotation
    • http://b40555.handyfriendship.com/upload/files/67081813185.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/kegemazomez.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/84768067664.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021916352397892.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3df8a119---sawosukitizakigegaxu.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/52098325238.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/97075343802.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/rojejimepa.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/77088150699.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/3278688826.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/koratufesip.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/fetamodonusimiwamagekaliv.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/67589028766.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/91335117870.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/safugojumixosasit.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/pewab.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/74033316016.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/vosewetevaz.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/bebipifaroxefi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vatetadeg.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///zivobin.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/92134088805.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/wizizomogul.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10328 bytes
SHA-256: 7f306201b604e1777a8ec275e4824dadeb4e248233942ce70ddb842e3046aacf
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 17352 bytes
SHA-256: 2df886a2c2a271dd70fb33275f122c0d99097e29a6021597ccf8744c64d7ac12
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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