Malicious PDF — malware analysis report

Static analysis result for SHA-256 d015ecedf3a0bc13…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 11:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cda20e1ec9b2a6abe59e3bb2d8c105cf SHA-1: 408213d27f75a6b2e2a754a66e258dec9a201e68 SHA-256: d015ecedf3a0bc13b19b92be103dba995588bb213470fa6d9371250608f52a34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://medvor.ru/uplcv?utm_term=labelled+diagram+of+skeletal+muscle PDF link annotation
    • https://fenixfalt.com/userfiles/file/legexadosejopabimosen.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/78798116885.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41372897015.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/94971ad91e9e40ea4f76d4284416f0f3/kobowusigevovufabara.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/veduvedikitejotemeni.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fac758d01---jirakefuzawewewilarovu.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wevigumuvoludaf.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/25718694941.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/nofarekorubinol.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pawojemowinozuvotifepuk.pdfIn PDF document text
    • http://csp.hu/editor_up/86044601596.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/12701987261.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/tibagekobe.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/zunawa.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidibasup.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/61157790617.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/wonubekedij.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/nudutozuvepuvazogunu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/89986378851.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/tiwamagopedo.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/vepurilewimiruvafu.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/saxabagozeba.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_off0000cfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBC 11004 bytes
SHA-256: 9982db43b36356318d6a98604e8a58aa6210707c621df1c8314e9e71659a4896
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 17720 bytes
SHA-256: 32c7731e5c36e275a2453e01cd24ea5ee6163a9632fc89412412e9311e499804

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