Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa992c2804387ec…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fd78961da0deb3d5d780d65fd358325 SHA-1: 50849b7bd977c97b83ef3612e775d7d6de145fc4 SHA-256: 2fa992c2804387ecaee5fd38d91e1176c7bbea792343a236a55e4db47a49cb93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious PDF files hosted on various domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

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 http://galerie45.com/userfiles/file/24702556984.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7119adaef296fdcd6803a83eb32bbc85/serobowibowawemebo.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/84492825835.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/nupamejeb.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/kanororapazanajajiwepaga.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/17017914152.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/15409835431.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/53840672355.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/51902284129.pdfIn PDF document text
    • http://dongphat.net/upload/files/92623164462.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xanemiv.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/81199965311.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/e4ge8gnrn48bjp1c93n5s3rvn6/40664650866.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/62305395536.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/senajev.pdfIn PDF document text
    • http://tid.vn/upload/files/nibizeserabukevawafexuja.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/xujefatazixilavunosuza.pdfIn PDF document text
    • http://gensugroup.com/upload/files/vobifonadevunivomiji.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/puwenavarovuxasuxexem.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/28218147328.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/fukow.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/38647121595.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109041402563473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=golf+wedges+degrees+explainedPDF 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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16972 bytes
SHA-256: d789b93a2ea933a0286c8b6787002942b58d46966336381b21f72153cbf18569
font_02_sfnt_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 10800 bytes
SHA-256: 3b613002a625a83f09bdb4c0908cf1dcb66df23cb53c748ca3d288dee541899d

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