Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dfa219971931c5…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 02:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89b402bc53ce22934bfadaabf9852392 SHA-1: 4568eecc46b0ea276c3190692df6c5e688ff1e42 SHA-256: 66dfa219971931c55fb08e70314dd32d1679cfc8716da7c38e6bbe4da097938d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://oniceh.ru/uplcv?utm_term=tablets+of+thoth+pdf PDF link annotation
    • https://darkoyunpin.com/calisma2/files/uploads/36639812365.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/43815418342.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/485bd52ffaee8be2f6b5aad0394e362f/walezog.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/3227405460.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/9696732345.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/73364517808.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/87423717256.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/vobiputexisotudelopuzuxux.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/16585231406.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/29c6b5b33bbd415410fb48dee8ad7514/zekogekowivaz.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/57272270340.pdfIn PDF document text
    • http://kientrucqhouse.com/uploads/image/files/15753833462.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xutenemobivedapin.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/27310622004.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/590367280.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/8587363875.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/xepigepepusonosejinefum.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/puwokokajojexudokorovi.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912212741621242.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/60796977543.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_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 22300 bytes
SHA-256: 228e6fa5a544db0767be208410473b5fb9cb9c194d2397dc399336471ac9eda0
font_01_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E7 10404 bytes
SHA-256: 26209a3c9366ebfb14dd9c00d8d20c3bf5320aa6cedbc79300cf3ab89efbddbf

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