Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a8a1e28cbb9ff3…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0daff9e8e9d3aafcb8ec53546c36d3c7 SHA-1: 02c5eee338506943170bf3c5903e504a0c3558a3 SHA-256: 45a8a1e28cbb9ff377c341b39a02a8907d4b3fa1e79534a4a96c1afa2e0884e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and presents as an image-only document with an action trigger, typical for directing users to malicious sites. The numerous external URIs, many pointing to PDF files on potentially disposable hosting, suggest a link farm used for distributing further payloads or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yauspeshen.com/ckfinder/userfiles/files/7908774097.pdf In PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/muwegeserekikamirabukimut.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090304171473499.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xezobupix.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/33833852986.pdfIn PDF document text
    • https://amgaa.org/temp/files/suvowusuxozokezazobaxijuf.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fulupipesomugusa.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/zifexoxixutagufimake.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/gutugulagituzezogazutomo.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/46900195997.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/nonosapasiporudan.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b2d00145---69092708776.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/24572009157.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b4895fd---26019659431.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/17575183126.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/dodolifanenep.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/wufegisuzewewagigag.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/52210520482.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/71823883225.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-24/20210924072551290619.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/71191190735.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/jegelunagemonajadoxil.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/zujijomozixomefisupibakof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=estimate+computer+power+usagePDF link annotation
    • 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_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 14368 bytes
SHA-256: a45b4b9321a86b4f15b1399d2f279c5930f40108266448b4c060ef82d07c73b2
font_02_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10736 bytes
SHA-256: 5f3a48ec410b5afab8a92db5a004e270bd8924529b29ee31de70fabfb4c17ff8