Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d92324727256fe5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 09:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 730ad32d7533ad7dad8b778918d17e94 SHA-1: 98b410b2899e53908f71ab3168c18f2b13dabb8e SHA-256: 5d92324727256fe5f1cc58e1261e69dd2b241d99170f2f601d3979d92416745c
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=farm+hero+saga+mod PDF link annotation
    • http://saconsultancy.com/userfiles/file/42200410335.pdfIn PDF document text
    • http://fullx.net/files/xuzawexipasum.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/79045492138.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/jurudoruzugowazavufus.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/supukenazowexiso.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vuloxomebexavimemo.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/12086578718.pdfIn PDF document text
    • https://ewt.cz/res/file/xowadironutonilete.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/volosonivo.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/42120655299.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/90784669462.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/12555097256.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/ranoko.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/wogefapakexogel.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd33dbeb9---57437057346.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/roredono.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/ditagepevilovowofofus.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/rusegolujomub.pdfIn PDF document text
    • http://devison-matras.com/upload/file/vidofetuwep.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/konola.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/7080681011.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/sigalixivemof.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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 17632 bytes
SHA-256: d4d24c32c8b63457803799c1755c4e62c02112e67a56767efef593c5c9d16cc4
font_02_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 10332 bytes
SHA-256: d9f4de11e8901461ea5af0ef7988c90ffbf7a174aacf4e222cd9f708e49b24c8

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