Malicious PDF — malware analysis report

Static analysis result for SHA-256 9329dfa39b25ec44…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 23:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b329bfabbabf735bc193c89eeadf6b1 SHA-1: 2611b28e2f9cb7ed24271f5d60be9300fee75996 SHA-256: 9329dfa39b25ec44a47a096b5f3d67a3b712f5b9f635a3588a5b9cba5b3d2dc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. ClamAV detection and ML classification further support the malicious verdict, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cgmorenanews.com.br/ckfinder/userfiles/files/mijedanunawufirabazoduje.pdf In PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xajavavum.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/vafiri.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/zesitubareritegamet.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gowukegafonezoweg.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/43993111341.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/27425148658.pdfIn PDF document text
    • https://angkalaris.com/contents/files/josepitoxobirowumukotaki.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/78018906238.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902191648_gaufv4.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/560c24b97896efcccc086bbcf8ade69e/vovezesujuwevanidivapot.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/91225475348.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/duzuzujan.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/3187241080.pdfIn PDF document text
    • https://digireg.nu/upload/57651488030.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/46157084985.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/vaxetamazevalakupufa.pdfIn PDF document text
    • https://motoralbini.it/files/file/58362938043.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/bemafibuji.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/47432862807.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84949783541.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b050e23a6fe184a395517494565aaff5/56144754158.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/kekimub.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/vixinatugiwozajovuzula.pdfIn PDF document text
    • https://maturana.cl/upload/file/7165343972.pdfIn PDF document text
    • https://cargobull.cz/res/file/zinivorela.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/44697168266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vsco+happymod+167PDF 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 16180 bytes
SHA-256: a1248b582b00b17d03e5013ea9a3a28a15e20da071b7259fb98db65fef2d6146
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10560 bytes
SHA-256: 80c4da470b2e4e19f76414b30d770d671b1f00e832bc5f4f23b27c763e2e9439
font_02_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1