Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3321b37dc23a7a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 12:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1dbe45fb12413d0612bc92c9c65d0b8 SHA-1: 5df433264993f788322fee3b376b41d74dc691ec SHA-256: be3321b37dc23a7afa4db742994b72416b8609fd809293e7422169ffe971c04b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=new+interchange+jack+c+richards+pdf PDF link annotation
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vezunogenijudupimunul.pdfIn PDF document text
    • https://beaszemin.com/files/33180704286.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/48167408901.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/64258628152.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/13755068691.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/wemiwevenojuru.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/42393310877.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/dagaminumisesiwefasef.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091117360773499.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/54465464395.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/68554189799.pdfIn PDF document text
    • https://shevian.com/images/file/20615849324.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/52056092629.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/72223991097.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/65133013791.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/sulubazu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/75c0ad6c0c3bf477f726bbba015db314/77475981787.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65413330682.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/loxabaxanafeboti.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/96369797778.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/31802400579.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25734552051.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/bopodol.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_off0000b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80E 11016 bytes
SHA-256: 8b667dd749edd09ca862338f649fffd36c287388276a43070fdd1403e9237cb7
font_01_sfnt_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 16824 bytes
SHA-256: 4d530f7dd527d037b4dd24db03c1c0d820cdfbbd2f201181a9fa0b84a0fc1410
font_02_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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