Malicious PDF — malware analysis report

Static analysis result for SHA-256 e752b9255a65458c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 21:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 96815c5984450efb7ab44a40eb5c003c SHA-1: fa2ca01ad1a9f6724405afa029b578083fd5da32 SHA-256: e752b9255a65458cee614fcda73f42db18dfae894cadf366bb2aeb76f0d387e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references numerous external URLs, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a trojan payload via the embedded scripts and linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://chcial.ru/uplcv?utm_term=paranoid+schizophrenia+quiz PDF link annotation
    • http://meimagedance.tw/ufiles/files/lonudipi.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/85183696155.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/73561544887.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/beporerejabodubigig.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/divodasubuworut.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/lusidujewa.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/sajikesejekobomikoj.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/8788172163.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/fimewumimafulojivep.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/89966980889.pdfIn PDF document text
    • http://www.moyekolodin.com/files/tilibemin.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/widokagokizux.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/xupizalojaguwid.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/79936791927.pdfIn PDF document text
    • https://keongracun.org/contents/files/36150607995.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/vuzupofig.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/34584949476.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5f768a36bb3755f29a90e8e6a800c9db/jidoluxubajimixiri.pdfIn PDF document text
    • https://timminsrenovations.ca/file/7k9AlcJorlzet0O0.pdfIn PDF document text
    • http://marine-inox.com/i/File/gobegosoboninuxomatesame.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/87621120639.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/49869801161.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/lidojud.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/zavaxoboru.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/68712233401.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/subaniteporaxalo.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/44986891030.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_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 17820 bytes
SHA-256: c04e6b81dc03cfd87fe298426509ae6545d6d8e67634d7c9e3e353b6772f9623
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10772 bytes
SHA-256: 04f32deeb67f04d4361ffdfc6b625444f35e1ac36d4535274f317bedf04f5243