Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92f09c82f5c7832…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 06:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 301fc9737df4dc29698e80e551deba0d SHA-1: f3d6f50877c2b19e2dd37fbe16e4ba187a0127d2 SHA-256: c92f09c82f5c78320e4bdf40bd63d9aea4dae90581bb07044fe46f890fd43d12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of multiple PDF-specific heuristics further supports its classification as a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://liho.cz/UserFiles/File/23033287137.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bea359aeeb7af0368476b61f8623866d/423082098.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/87224001582.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130404328011---fajiwolafopitimoxuzex.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/84089524811.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82093808c---66370836565.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sikejajunewanasafubo.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/53906770696.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/37619159791.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/kafozalujokadutew.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/wafedirapimuzujuzuwikel.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/39622358862.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/8690954032.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/gotaf.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/52871482583.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/fuvivakawuxib.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/49686436392.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/tetanubimanunuzurukuse.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/78878003481.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/63795434750.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/69576043848.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/midadejijogevegepinifiw.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/49855753027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=msb+academy+ethical+hackingPDF 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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 20784 bytes
SHA-256: 2f7f4e27f03eeb65c282612da6f8c458bc06208fd1846bdadf7b0142a7f780c2
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 10936 bytes
SHA-256: b597c457a8d043e4eb41d9328d170b6c9d1f7cb1793644b91f66853f0b48f081

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