Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fd3d1126114d5c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 15:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a58a9e71d2af657cc9d5e2447102654 SHA-1: 552527d1c7e9ba7cdc5cd445ae2db685adbae950 SHA-256: 99fd3d1126114d5c0fd29283364cd78436073f630c3e4b6e2c61f06f32a71ca3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism to phishing or malware distribution sites. The PDF structure and embedded URLs are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=file+manager+permission+to+operate+sd+card PDF link annotation
    • http://rsst77.ru/upload/files/lidok.pdfIn PDF document text
    • http://12shio5.com/contents/files/35489653804.pdfIn PDF document text
    • http://tabletopad.com/images/file/lejatixubumenovaniv.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/53478959695.pdfIn PDF document text
    • https://j26clean.com/upload/files/bunex.pdfIn PDF document text
    • https://schmitz.cz/res/file/sizujipunamobujago.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/folizatolusurepodip.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vatarepazenabidudajedunas.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/fosefofe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148ff6e82b08---54955849467.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/xoboputozolerir.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ec54bb03c3b24bee65c23eb9eff2ef2f/51463847146.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/6302901985.pdfIn PDF document text
    • http://penetrat.ru/files/files/xazonefijisafotaw.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/95907916921.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/48129676991.pdfIn PDF document text
    • http://autodilygood.cz/files/file/98381905582.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/ferixozosigitegivesax.pdfIn PDF document text
    • http://popmetre.com/news/files/47096748020.pdfIn PDF document text
    • http://www.toptehnik.si/images/91300698334.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/memaxovimobajirelinuvedat.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/taxeba.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_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 10832 bytes
SHA-256: 971aa30c7860c86cd7e06459f31be98a7546a0222bc48a1fc454a4243cccda10
font_02_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 18792 bytes
SHA-256: 7f707e2df6edbb33099e73d503f2f3db20182e8051bcd429b03b23f96a68c15f

Open this report in the interactive analyzer, or submit your own file for analysis.