Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc859604bf9acb51…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 18:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0ab03c3c77e8fbd7b70e3361d216dfa SHA-1: 082bf0bc4a4f2fc437429ef96c9feebc12ef417a SHA-256: cc859604bf9acb51aaad0d0f5e767c0efdfbff8f3ba9170563fee30001063841
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=kotor+android+free PDF link annotation
    • http://learnazia.com/fck/imagesfile/8321389237.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/38673564188.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/18987828261.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/nubufibokuvasabigoxezik.pdfIn PDF document text
    • http://fruitsad.pl/images/file/juvunilexisiforalawi.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87935519085.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/94727049668.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/sulujisajisovebitiwanaro.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901100552.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/36290223597.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/88163012975.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/batuvatosovetoxazenoden.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/saserupogobimitakuzolareg.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///negegibixilodalun.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5beb204f16a5fc36fa927d77913d17dd/kupupefupixodesebowizir.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/91337857995.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zivuxun.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210901065539.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/tafinetutob.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/90558821422.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/muzupukejupanukomig.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/4239135579.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tilipopile.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905130036812074.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_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10124 bytes
SHA-256: 8d7017b8ea55084513b916f1dc22a13bff984a30410f639d8c806be099c4e6ec
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 17552 bytes
SHA-256: cb74b89d4c09f663437aa023119e0cb935946c79914be3a6755d5ce127695940

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