Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc61fda8249010b7…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 11:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c14fc57778e90717a071353dc19fac4 SHA-1: 554f4bda292d6b5d5cda8e755f5ed09bd2e36007 SHA-256: fc61fda8249010b7f1a3560e3d8bdbb8c44caaf5713f75af876d9ba803bd3698
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the overall detection points towards a malicious document, possibly leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ac390520---5801368853.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xajobulofozuwavibexolapap.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/73002559498.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fenupuduror.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210907_AE7343469C47CFF8.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/vexamoteparuganu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mamefidevijereli.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/48113817616.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/6671315085.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/xosawi.pdfIn PDF document text
    • http://newworldss.com/uploads/file/32023431134.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/88208213715.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33379367621.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/96526092694.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/65022884127.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/gepotiman.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/luruxuxozukowatigufo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/dejenekowokomupasasaz.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/80017662140.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/36847512018.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109121554161431.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/nixogomajinanomegaf.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/kusanovobi.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/89221055489.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/91190341068.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/muwepolir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wwe+2k15+full+game+download+for+androidPDF 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_off0000b5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 11008 bytes
SHA-256: 75233787519a84d06e4d4bb95f96c9a8b76f376548cd854e0506ca22f4c7f9e8
font_02_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 15220 bytes
SHA-256: 985b6d493c9559f2b0bb7aeced32becec053cb15af0fcf2ec59d3aa208227981