Malicious PDF — malware analysis report

Static analysis result for SHA-256 203cbb010ab8ad73…

MALICIOUS

PDF

86.4 KB Created: 2021-09-24 10:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64a9f61979d247cc673176373dfc4c19 SHA-1: d1d17d78582dcf6eb3164e0dd101dc3a42b9c23a SHA-256: 203cbb010ab8ad732f175cad645c1a9348774b98bba0bdfdb43377cd300ac72c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the overall structure point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7ba6d6a9be322ba302367ca51bff48f5/64404102552.pdf In PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/43389617967.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fidigofagirebaf.pdfIn PDF document text
    • http://tykhchem.com/upload/files/1769528927.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/64629197004.pdfIn PDF document text
    • http://dakov.hu/_user/file/linakererevujorusex.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210904010755_760752062.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/sefitajitenin.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/xugiv.pdfIn PDF document text
    • https://jetaime-shop.com/files/91225172564.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/15920205219.pdfIn PDF document text
    • http://termocity.by/pics/files/natogotag.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140afbaa5ed6---kalasukuxo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109050354148320.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kodogowibisizonozofijulub.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/kexemexuxamagelalavob.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/piduketazo.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/gimijazigogafajoled.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-17/20210917104701116097.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/55849629975.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/botetutili.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/70159248943.pdfIn PDF document text
    • http://patroha.hu/file/56044348949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jingle+quiz+appPDF 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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 18984 bytes
SHA-256: da8c4c17f82456250c0d554b5e820c8686f949a127e4e2d0148a73091e79357f
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10236 bytes
SHA-256: 010793956aba4cd4bed339527a32086fba2d28f5c5fe6e333592b7e715c7b5d9
font_02_sfnt_off00013418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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