Malicious PDF — malware analysis report

Static analysis result for SHA-256 af83970e18fd71fb…

MALICIOUS

PDF

69.2 KB Created: 2021-09-22 10:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee4c806de741aacc8ecc2f3a48341ef4 SHA-1: 0e2a1095028114a679c3c39666ad7f752ef14b6d SHA-256: af83970e18fd71fbde6680f013dd290e1593c5ff536ecb8de42f211b253d6253
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fazekaskozpont.hu/images/upload/file/2639507859.pdf In PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210915202118.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/meguzinat.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/bojubojuruno.pdfIn PDF document text
    • https://palet-school.com/files/files/dopanoladut.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/23241543160.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109200915071803.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/ledobexeguvi.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/22170110061.pdfIn PDF document text
    • http://enricobarraco.com/files/xiwavafinawedemefuzida.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/ledonimabusenipi.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/96376944379.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/35115137542.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/nigekunaropor.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/72389747056.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614885b25bb3e---gunikaniwaxizoreg.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mafebosomonukevegeza.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/98262753369.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/55367925334.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/82292721681.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/39229855523.pdfIn PDF document text
    • http://www.depomatrial.com/file/zufebezadu.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/75983729526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=words+that+start+with+fPDF 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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 15220 bytes
SHA-256: ca53af4ad0a14bf678a51c50f6021ff61cf4de8bd4a77d7f5b047ed98d9c1276
font_01_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 10248 bytes
SHA-256: 4fba06e00e7a2fc33d5f7cad51fc839f77a1bd42578ff9e37f2ba08d4903d2c7
font_02_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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