Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72b19cf414c08c2…

MALICIOUS

PDF

92.9 KB Created: 2021-09-12 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4301a0c03316086d24546b5599de2778 SHA-1: e0773f24a43e43098b3a82155f454b4dce20d9c5 SHA-256: e72b19cf414c08c284342f25cb484813920f667ee27c8a2076daeb94fb5ef374
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the PDF's primary purpose is to redirect users to malicious external sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://trungtamsangloc.vn/uploads/ck_upload/files/mexulu.pdf In PDF document text
    • http://live-net.it/file/33556542230.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/54137989140.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/50822828799.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/jorujaritowufuz.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/28053849231.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/fojirijilu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7b7aecaf---35266648929.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jegorijizegekesukefelube.pdfIn PDF document text
    • https://kiptep.ru/file/74957384356.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/lufiveg.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/45161769621.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/48563315557.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/rifatobitibelo.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/866423795.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/55429037994.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73918537697.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/faroxafik.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631102826.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/wugetupimilotemuzonup.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/43469908091.pdfIn PDF document text
    • http://ud2-140.com/files/49026346553.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/gujiwasabikunudumazuposad.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lusatinav.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1716fd2b---wugatabakizazogisezuseput.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/72577672661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=daaka+movie+onlinePDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314056263548.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_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 17584 bytes
SHA-256: a744bdb5cf624604b024313c9e33454c8e2a5da4c9571d3cc5a45ca159231a26
font_01_sfnt_off0001373e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F55 10064 bytes
SHA-256: 91b525e1ae914536d9ca010493eaef88e957a10786e393f91994b7f0a07b679e