Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da04a082dcbebf8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 20:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce9ed6bff38280b1bc859332f70a90b3 SHA-1: b89765d567821b59a67903987a00d935dae7a979 SHA-256: 7da04a082dcbebf80796cc4216f1d8706efe4528394d8a391c5ef4a56f5d9781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using disposable hosting for such links. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://huntic.ru/uplcv?utm_term=afrikaanse+bybel+app+vir+android PDF link annotation
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zixebetopadumonupedet.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/potipuwomavisi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/fajavagogaxamoxifosazuda.pdfIn PDF document text
    • http://htwy.com/upload/file/samadokizaruvovumafujev.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/boviwulogaboxobi.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/latepesa.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/kogigak.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/33291835895.pdfIn PDF document text
    • http://rilta.net/userfiles/files/90915731654.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/90360461954.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/zilexegazotakufize.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/wibivezomuriviwanebev.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/vepujegoxamovame.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/17177375384.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/16786147999.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/webopozexaw.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/zewifinevesozujotojeruxob.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/72160813992.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lowafujijikabogetakikidu.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/ronadasaxebesefowik.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/21446451533.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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 18156 bytes
SHA-256: bb4c1bc5fa2a0ebdfffe237f611c3d19a3ce8fde165e7981ecb61d05bcc50ad4
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 10788 bytes
SHA-256: 50c4a8825e66db0cc6d48ae36c63e529db0471e31f76eb6f1259967d7f21f661

Open this report in the interactive analyzer, or submit your own file for analysis.