Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb30d2668c179ee…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 21:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b0592c526b3b64ae2cdff19ab74eb3b SHA-1: 0809435db7a77dd671c23239c5bb150f99c95233 SHA-256: 9cb30d2668c179eead4b6bbadc37cca3acfa8470b83624666f71c4a63b950990
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=sula+pdf+online PDF link annotation
    • https://augsburger-dartliga.de/uploads/file/28564084345.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21894418292.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/94865997890.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/logufefan.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/45288024613.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/xukeraxosoda.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/39338867946.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/74001423373.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/82079744413.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/97637150128.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba6893fb8---vadegedekazekotamuw.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/2545889942.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/61506711926.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913205118106191.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/52943198560.pdfIn PDF document text
    • http://davobio.com/upload/files/83639690248.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/zigatimanuwujanexob.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614203bfbb269---wiwadixut.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/43541836641.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/90362042420.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/ganupudugejuwovexab.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/25266066528.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/91846115715.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/44235984988.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fusuwigiwofutativinexawoz.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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 10300 bytes
SHA-256: bff4e620f17d32f55e66bb59ca71a0f968b3065abf3fdee5d47e7a4ddd944e15
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 18536 bytes
SHA-256: acc7b27ad60e25f598289d710e8657348374b301425ad14994ea21b47b92a78b
font_02_sfnt_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1