Malicious PDF — malware analysis report

Static analysis result for SHA-256 380a544c75387c94…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 10:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63850b3b7a22b9f876623342210adae4 SHA-1: e617de12ff92eca80a8cffefc911255d5a038f33 SHA-256: 380a544c75387c9495fc8f759970005665539bcf70b530f503e9d0921c807c41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document functions as a link farm, directing users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of embedded URLs strongly suggest it is designed to exploit vulnerabilities or lead users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/44997365466.pdf In PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/82912142161.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/42117004090.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/wotitus.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/89458247150.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/93091244870.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/3141360071.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/papiminuti.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16130a5b2bb49a---12800037547.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/23336324842.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/29399026692.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/57957414691.pdfIn PDF document text
    • https://tele-video.ru/upload/files/vililubupinekapezuru.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/bilojomojoxali.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/73919153905.pdfIn PDF document text
    • https://auto826.com/uploads/files/garajotufusemupadodasok.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/napetazupuzo.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/24902786329.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/fusot.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382c6cbfb3e---rejogejeguziwuromuve.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/44092284539.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/selum.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/fezetobobemowemuzixi.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/10489837864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=app+is+installed+but+no+icon+androidPDF 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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 18320 bytes
SHA-256: 450f22f061a2a5122abe1e7d106b80dcb80b0dde2f4367fd53916f86a084128b
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10728 bytes
SHA-256: 47cc8f192de1eaf65d5e86821e019c10437dee467bdfd2d9af35b105a9e8cffe
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1