Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23ca291015709f4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 18:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 61301593d313a2640162ff2f9145ae2e SHA-1: 5930d554845f0d145d4cf6e2670192f57b28674e SHA-256: a23ca291015709f4bfec1b90dbfb87640a5c7a8292460324f0ca13a7cb9fa700
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=harder+better+faster+stronger+app+android PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/39854707a890e901d9fdab8ab8aaf4ae/bigaribumozikuwosa.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/zusalanowozorinejemasabe.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/54687696503.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/14024079726.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/jeson.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pekedosabijopuxudejasu.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/67575202490.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/58300349422.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/tiworojo.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/90783503509.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/27110776365.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/21561049679.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95610347198.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2a939d93---nikenosinerudiwakerinega.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/wapewotubaladawinixazu.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/31955879511.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/43588270037.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/saxadif.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/fazojaber.pdfIn PDF document text
    • http://apismorava.eu/docs/32323829630.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/56438122032.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_off0000ae99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE99 10760 bytes
SHA-256: 3d3e09c4236574812d583f4f3ed1c0dd78886da8229107e5eb4e28fb22280015
font_01_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 17256 bytes
SHA-256: 4bd117c1c446a6676a30840e29241cefcb87dfad5db139d46724a6399f9e62cd
font_02_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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