Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22f08b370669e69…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 10:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3d7519921378a786fb0a69fbadbaef3 SHA-1: 96204719da93a55611e7d18fe01a3d9dd50c9e8e SHA-256: d22f08b370669e69a9c9f24023ff0dfddc683ee2b44c8cb27e89f2fefc9d2566
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. One prominent URL, 'https://coretry.ru/uplcv?utm_term=pubg+lite+hacking+apk', suggests a lure related to gaming or software downloads. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent, likely to redirect users to a compromised site for phishing or malware delivery.

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 https://coretry.ru/uplcv?utm_term=pubg+lite+hacking+apk PDF link annotation
    • http://abaj.cz/UserFiles/File/73465479850.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/53794168240.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/18184195007.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/rululakelitufadofijafete.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/7856794089.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/88111724911.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/wifekanisuwokoron.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/xavarujokinuravaruk.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/73836929598.pdfIn PDF document text
    • http://webbuilders.com/files/file/60856851046.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/42686904234.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/nanidipukitusubidaru.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/44784260591.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/retimezegizibexosawu.pdfIn PDF document text
    • http://hueide.com/upload/files/36007602000.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_761FC8A3BB828AF8.pdfIn PDF document text
    • https://unitjaya.com/contents/files/52241572383.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9809c9007---78223805720.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mefutaluv.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/jatoxazejiwexaxegojex.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613320d2e956e---85056482090.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/fasadolenivawoxawofo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/21344647291.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wifijexikukab.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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 14776 bytes
SHA-256: 7b878f950e97d6ce84320fd2f662479e2f13b6a8d6899eda33a16ae9fb0e42be
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10600 bytes
SHA-256: 5f9fa950616a45721a453d4c5c784ddd499361e8ee6e5fbdd32f20a88bff35c6
font_02_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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