Malicious PDF — malware analysis report

Static analysis result for SHA-256 82353f0797e0260f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 23:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017352eb6254e1e829c779e98bf3f9cc SHA-1: 9a2ea9cac7f7e06280c5c7cbb635b7aa39c1e219 SHA-256: 82353f0797e0260f7eb04d8120642307002d2fc27e80f97aeeffe79a7e78b12e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one that appears to be a redirector with a UTM term, suggesting an attempt to lure users to external sites. The presence of external URIs and a link farm heuristic indicates a focus on directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=google+play+store+telefona+nas%C4%B1l+y%C3%BCklenir PDF link annotation
    • http://akiisushi.com/uploads/files/15111669900.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/gowotile.pdfIn PDF document text
    • http://megalaserasia.com/upload///feselonumotetejutikun.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/tojukexotowi.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/88707923614.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/beborijogur.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zimizipipab.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/vojenawi.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/19000512736.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sususadetu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/difefimusosodinive.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/fanixebu.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///girotuza.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/vefanibejosoguv.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/22608886087.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/zimokewusixevolusom.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/zaxipoto.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/napatebaselowozeras.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/74772842819.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902125215.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 11016 bytes
SHA-256: f9ccc1ab3ac0f8c59f208af28b37c76de15d623c749f20485010254ee574b782
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 17404 bytes
SHA-256: 15f8e6868bc128f7bc38dbd169776cfb7a38f579dd6820b5abfa1bbf21f47614

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