Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c723c5d4e4fa4dd…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 10:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a6b740cf353ae9f7c4700e536b2c1ddd SHA-1: 0bcab9161856725845062fc748d45d8de4757dd1 SHA-256: 2c723c5d4e4fa4dd90222985ca014d7aa4c6b00fd7186177c6c989b90c77ffdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://oniceh.ru/uplcv?utm_term=free+rhyme+dictionary PDF link annotation
    • https://portofcrotone.com/dati/upload/file/luridasigezoxujid.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/fiwutat.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/28678507855.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/datozofejikaduwezod.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/2502407189.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/68254977573.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/96091433117.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/88058737765.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/64120804365.pdfIn PDF document text
    • http://santehnika34.ru/images/file/wutafosewomegedasun.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/61043264840.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/xukokunudoj.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/tofulugudim.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/duvuledoru.pdfIn PDF document text
    • https://triosms.com/userfiles/file/semimikokasojedojanumejaf.pdfIn PDF document text
    • http://18554080.com/userfiles/file/31364588637.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/verosabajajavekago.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/gemafoxadesagenar.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/jabowetot.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/tobipepazifolibif.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/werukotor.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/barekisatipul.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/98041161834.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/27968034884.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/45889531769.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/wazawudofufi.pdfIn PDF document text
    • http://askort.pl/Upload/file/27153910911.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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 15624 bytes
SHA-256: 039f115d82b6564484b0accca843e5b8da2d9df0be5643f2cee971e0af9c5e90
font_01_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 10512 bytes
SHA-256: bb6ad5813b25164b5cf9ba3daf6f71db55804b8d7d4d8dc8125de99793157491
font_02_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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