Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f639dcbc9561b2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 10:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e72c8856c50fd07c233468e84caf88bd SHA-1: 5cf0f55fd7f1c86a12ae3fd061a100173eb25b32 SHA-256: e6f639dcbc9561b2b289afee8c58092dff305b9931947d10bc77a175d8a5115c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://ktai.lmg.jp/upload/file/vojoxamuv.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/woredepagoxevumu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/92706991385.pdfIn PDF document text
    • http://armanetti.com/images/63032690516.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/negujojuvisebozigokofapo.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/totapi.pdfIn PDF document text
    • https://paradigma.bg/uf/file/9201163243.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/57167508117.pdfIn PDF document text
    • https://insp.biz/img/file/6683357280.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905173255.pdfIn PDF document text
    • http://keitbg.com/images/files/titumuwifajesudeji.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/famut.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xamujito.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tegino.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f531fa3e---42639768565.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/919359997.pdfIn PDF document text
    • http://101balkon.ru/upload/files/bosuvumagiboli.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/rinikupomapiwumufatuj.pdfIn PDF document text
    • http://theponghop.com/upload/files/54814471081.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/jixaremotuvibizewiw.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/32078608009.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f7c57d9f---22920283465.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/gogatadiwit.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/zijal.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jijelijuxububemakakoj.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/lufejigotokabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=my+hero+academia+free+online+streamPDF 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_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 10848 bytes
SHA-256: 9fba78ca8ec96e3b3ca03eafb3339e2385a45e9d4f363474f919cb109f0d94b8
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 17440 bytes
SHA-256: 1404bcb61e0208bbe5eb0d4cc5545a492588ffa18e3130ac3a4e62f653fa4129
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1