Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac2ce0613976309…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 19:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e9c9dbca28ddc8ac351694a6df51474 SHA-1: c53d2f035ea86a39d6d6b94824a2961da1f0a447 SHA-256: fac2ce06139763091ea2df05b524645dded8bae506d99ad7aebe4a9940401ba5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external links, many pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=infinite+flight+apk+all+planes+unlocked PDF link annotation
    • http://amadpich.com/userfiles/file/lesomodeperugoketozikowuw.pdfIn PDF document text
    • http://maulich.vn/attachment/files/jivapivegirojopufe.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/29586995187.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/23548529011.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/tufiri.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/wiloxoraroboxogesadubero.pdfIn PDF document text
    • http://bamor.org/userfiles/file/99135595787.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/33309149138.pdfIn PDF document text
    • https://citronel.com/userfiles/files/sikivimopedonegogigaz.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/85092585003.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/51101709845.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lokaneki.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/79726266023.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/lisixojawifawuz.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/mavet.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/86594748645.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/xubixus.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/48011756080.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/12760165387.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/gikasa.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/3784151299.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/81554689894.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/37568016571.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_off0000b368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 10940 bytes
SHA-256: 738b04aec9020770b2e465a6a1721d831ff6187b4f2afa1964951cc8333cca9c
font_01_sfnt_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 16456 bytes
SHA-256: 9a2823ada16dbd35fbbc81b062834f3aad2d4673731451a55c3c170899bc56e5

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