Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0bb5a9ca305c77…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 04:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ccf81182d907717d38a8a7c6c631ea3 SHA-1: 529eb2395c59d5ad34d40de97e48685983159c15 SHA-256: 2c0bb5a9ca305c77ec039724d015efc0ccbf9ad1a7a0bba282e6285dfd7b2d86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV and an ML classifier identified it as malicious, specifically a phishing trojan. The file's structure and numerous external links suggest it is designed to lure users to potentially malicious websites, 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 http://yousefmaktabi.com/ckfinder/userfiles/files/duxegowobitejurof.pdf In PDF document text
    • http://kingtonkatsu.com/uploads/files/poluwiwejofis.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/kumimegukebuwafutaka.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/97193784544.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/5072374831.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ruluk.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/45251602447.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/benimupizelidesitudamazi.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/50681493194.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xopesag.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/jifewemu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/pufuropopusomanegoxawu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae766c1303---redugifitazejesudife.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/refukatadin.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/1519896302.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/17472175636.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/40813769627.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/69603037442.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/kenazuzikov.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tesawigofuvimagefunijuw.pdfIn PDF document text
    • http://bluebossa.pl/files/file/buzasewevi.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/55479520209.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/natiw.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fudemowabafexifisoperazar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=modality+examples+englishPDF 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_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 17680 bytes
SHA-256: 1a48c5dcc7f23dc1dfcc30ffe2826fad72272492b64cf27137132cdbaf400bf3
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 10948 bytes
SHA-256: ff2ea445c822ee0db3afabc24f2756792c3549ad354e1f78799892b89d537b29

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