Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cc5244f3bf8f2b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 01:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 675e61498416bd3321c596d7bfd614de SHA-1: 773f22c8cadb3c003ec57a500f22ebb742528a4b SHA-256: 69cc5244f3bf8f2b69f513450126e29da0e84b747c03981708d9f4f27a432953
66 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a tactic to obscure the true malicious intent or evade detection. The presence of 'utm_term=download+iphone+x+launcher+apk' in one URL suggests a potential lure for users seeking specific software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://pathtojanna.com/userfiles/files/18998245293.pdf In PDF document text
    • https://speak82.com/_UploadFile/Images/file/foruweragomakubof.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e423baeffeaf808115da6f658a95c9b9/buzazoretiwulokibokumej.pdfIn PDF document text
    • http://punaide.com/userfiles/files/93943523440.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/70649918346.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd19facfde---zojoxuvifoluriza.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/94154046309.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/48249107857.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/20159919045.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901112518_zlkjrg.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/43910369470.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/13523200779.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/56954221810.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/misegu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/doxixosevita.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/manipudadofurukaguvigeb.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/73239367675.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pofenilew.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/seragekenogiwifoxuwano.pdfIn PDF document text
    • http://zubrcup.by/files/files/75649933156.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kijubivitik.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/sotofarisinoxaluw.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/lenilagasebikumusole.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/xilapu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/49772956304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+iphone+x+launcher+apkPDF 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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 10728 bytes
SHA-256: cfe6bd818b9f30c9ac5d1e57f2aaec9c5cd45e8478f3ebf3b8c74d257881d563
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 19192 bytes
SHA-256: 85551b53641725c6284bc83ba8daf8457fa3a91e69ad498fa80859e67fde88e5