Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3c978ca8b45108…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 04:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ce82e834536dba27b2e2d7cd958e8f5 SHA-1: bb246bcc849f600c575575e8e03dd915a884d536 SHA-256: 9f3c978ca8b45108c865936ad675d82c1e8207a0b3d82729d215fff4ab581d44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=mt4+apk+old+version PDF link annotation
    • https://osakadentalcare.com/contents/files/jalodogagusipabosovu.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/zawilasuwexedixe.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/sodimoge.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/mavobidujilaz.pdfIn PDF document text
    • http://rentaruedas.com/files/others/poxozudesozomukoxupaje.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/83968068217.pdfIn PDF document text
    • http://bienbao.net/uploads/files/toxojefenopafuseje.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/dopifazipunuvop.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/12584693880.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/66715206943.pdfIn PDF document text
    • https://seerupit.dk/assens/file/lidulatijomitazap.pdfIn PDF document text
    • https://strechybenesov.cz/content/zosefobiwogadoj.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/nofavomawigutobufe.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/68654245220.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/74893742713.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/29301509925.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/26170613223.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jq0v3ab9m0p3573bkr5f82p875/darilefekorasotexuvudomil.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/tunenino.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jonuledivu.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/xejogisoxu.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/28426960611.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/88513440790.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/14924641801.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/50641266945.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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10612 bytes
SHA-256: c47a3090403b3ce91089e78c9dd2a2c3f84429a73c37c4c45e54e282c5262438
font_01_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 19164 bytes
SHA-256: 387db5168d16951a4ddaf8e0b76cf2952cc2c4b076d1182abcc015f3de6c631e
font_02_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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