Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cd5f85ac10e79c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 23:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 465a62552d17836712922e75ecda6eb5 SHA-1: 6239c5557369ae58ba5797d1298026c92f091ac0 SHA-256: 89cd5f85ac10e79c9293eb828b5762ea3cd0ffcd1c0fd32b8c4462a0ffde3b74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=is+69+prime+or+composite PDF link annotation
    • https://inprovitargentina.com/ckfinder/userfiles/files/94826181472.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/44186905715.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/8091293965.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/19142503456.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/94237699047.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/buwiluvapezez.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/1706656118.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/9614970146.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/6scel2lnarnaa8g6i4oiovcvl3/lanalukikixoxuwi.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/20665698351.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/73914082350.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/diburuxexonoworitoxoro.pdfIn PDF document text
    • http://myphamasia.net/upload/files/58680342015.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/25711990922.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090410534773499.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/zotafexaxajonuzefon.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/40795439361.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/tidejuzelaz.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/setanadodosaxozez.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/nimox.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/53ab59451435f047164b60992059a004/moligebog.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3813481141.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/bawesuwugapefakime.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/6448360918.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/73254872853.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_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 17504 bytes
SHA-256: 31afb04ad96af4c94f316c4472f30d1b6f6c517ed6418fd9e91afb0bf176a51d
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 10512 bytes
SHA-256: 712df0650e76bb354f59c5172b91f2d2ba669a72fb1b98155451ab1d22415d06