Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb76db7d92e8a10b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-28 05:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 422184c24ea57f80b95c69601a37747d SHA-1: 01327bc75997af60d022d9c8272c31c3f10d2380 SHA-256: fb76db7d92e8a10b8acf9646ea5759f0345f3ab26a2f2ae944e40e8a86ce7286
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://baobiachau.com/luutru/files/27275713046.pdf In PDF document text
    • http://productinfo.in/konadnew/userfiles/file/8863936168.pdfIn PDF document text
    • http://mackits.eu/image/37487571489.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/58280097949.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/44848902959.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/texapono.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/kabewi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7c4bdfd00f439880fb52ef5ab769d2ad/ziverodofejavigojegu.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanupajazopabap.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b8fee5196bff1a15609515a2a00efd82/41912088774.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/59954285118.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/jafejozesu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/36765502707.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/tawusunugusefijelazerupil.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/vumopurivozojelojokipan.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/55930624860.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613612dd9f997---93764064957.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vutowabomefozujuxaluk.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/bosagakowegutoburukuru.pdfIn PDF document text
    • http://med-os.com/user_upload/file/kesikikofejuzegodajusexet.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/60216467845.pdfIn PDF document text
    • http://iltorg.ru/upload/file/65016712107.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/43268177830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=los+seres+vivos+pdfPDF 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_off0000c239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 21396 bytes
SHA-256: f457fc4651fd40ecef16deba4627f699b9b9cc66cc16ffc12aeb2d263770f1ae
font_02_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10104 bytes
SHA-256: 50af039b2fc5bd47fafaff25c6de642ea49c84da3aae7c4f396d993d5b0b0fde