Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523b359661a14d9…

MALICIOUS

PDF

72.4 KB Created: 2021-10-04 08:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 247edc6c862f40a299efb6ea87b791c9 SHA-1: d77f30fea3da6509c1ab7a3b5a20745c8574e6e3 SHA-256: 7523b359661a14d9e458344bb825f37efc707f343b53581a64e0cc809732cf2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=rum+glaze+for+bread+pudding PDF link annotation
    • http://bonsite.nl/phpcmsys/file/87679296335.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/tesukukinofavexadefire.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kamenapujamud.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109232017114965.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/gupifibigoleziraxidomi.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/razurajisematora.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/sagivo.pdfIn PDF document text
    • http://workontext.ru/media/file/jejapa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe7491ca0---79004458365.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/xujuvuxudoruf.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161571b70096d4---82665120772.pdfIn PDF document text
    • http://emaaravm.net/upload/files/63857159101.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/68475821557.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/28187872704.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/62753935191.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/18405626966.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/7820397035.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/butobe.pdfIn PDF document text
    • http://elitvorota.ru/f/file/31437687354.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/89258348094.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/47010333357.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/40794735748.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/zesedosus.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/74342412730.pdfIn PDF document text
    • https://expomediainc.com/upload/file/73043017369.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_off0000b67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67E 17404 bytes
SHA-256: 5c7b7a9389b7f2a63cb32927d91bb80cc566994316ac7e03be9b23c5da5bf0b2
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 10920 bytes
SHA-256: 148702945d13a505a0330d52e6776d5c8323382687736a962fe236724c0e8c21

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