Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9161b9ff2980e4c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 03:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c09ed91214f6c7265eb8379c06d48bab SHA-1: ce462edc5ef8f8b2b8c7b72094ecf94743b973bf SHA-256: d9161b9ff2980e4ce1edbd63ac9ab8674377ace69b4534df82b36962bb4e9584
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=the+psychology+of+money+free+pdf', are used to deceive users into downloading further malicious content, likely by impersonating legitimate file downloads. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=the+psychology+of+money+free+pdf PDF link annotation
    • http://agilesolutions.in/uploads/88423466393.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613270f3138aa---xiwanag.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tizonumipepad.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/45807477447.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/tudesonebejixexulopon.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/jelorasajalarusibazoxi.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/nojesur.pdfIn PDF document text
    • http://fteq.ru/files/file/78960327776.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/88302944416.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/retazegobowopupufizepivat.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fevupusese.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/zedegigikebivo.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/10573760952.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/41962401619.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210911_023042_8637.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/4663216585.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/78877679493.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/38678492633.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/58686956134.pdfIn PDF document text
    • https://basisnomor.com/contents/files/gemaxo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/69532408140.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2e9fceb---58513296275.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 10792 bytes
SHA-256: 626cd0295f870ea7db3dcd8a89bf4990472c96d6ee7e10cc7ad4a5a49bfd9d79
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 17964 bytes
SHA-256: f88f19bc9a0802e6a30c7b03ab14dc7422ca3c90cb5a787a811113c377ed920a

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