Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3287816e4b42739…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 14:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 170f11a978bf2089ff4e95da6f9c28a2 SHA-1: f95a0397f57a17c9231e9cf8c2721334ec7bf67f SHA-256: a3287816e4b427395a1e7b34361708f5cc6c5ee1508dffe5c747016f55991373
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm on disposable hosting. The primary URL suggests a lure for downloading software, indicating a likely attempt to trick users into downloading malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=download+ridmik+keyboard+for+pc PDF link annotation
    • http://kientrucphatloc.com/upload/files/72632446235.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jevog.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/38581129503.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4856cb63---38272494119.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/21476133990.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/nuvomixuxeremifurasez.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/43075961086.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/wopiwefowogenopubemo.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/finovubufeboga.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/dojumopujusogamodeti.pdfIn PDF document text
    • http://qzgj.cn/upload/file/vulozepevefobirak.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/pefekifepegazafejanixap.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/34017692598.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/sonafudofobasemefoguf.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/73665275731.pdfIn PDF document text
    • http://julianina.dk/upload/file/84590609196.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/mowagotilenedirejodezadu.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/58779325191.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/wojudududozix.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/69977819624.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/72811688560.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/4254755573.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/vafixitasavanajo.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_off0000befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 16496 bytes
SHA-256: cbde6c4a1bda0055a71eaac154103f5101578d07747fbafd919529b7160d924a
font_01_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 10948 bytes
SHA-256: 1a162f4ab58bc7aaa18bcd03ab62d9d360f2e8a0b098fb6591357916d6eb921f
font_02_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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