Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9287a3d883c827…

MALICIOUS

PDF

92.3 KB Created: 2021-09-12 09:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 620736cc554e71e05d74f1ee52574c3e SHA-1: ce46d29ce8096820740b66a51a8131730b9a2eeb SHA-256: 9e9287a3d883c827089743c3be279f6a6459019cdd39f51e8188e8a1729bcd30
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with high confidence. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the ultimate destination or evade detection. The presence of multiple unknown URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74099683480.pdf In PDF document text
    • http://grandviewgroupresort.com/upload/files/tugowifedimudujap.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/1813267530.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/83227877960.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/kalani.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/52374177146.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/67564566117.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/kuliwexobiruzewonufakid.pdfIn PDF document text
    • http://keacg.com/upload/files/82066592852.pdfIn PDF document text
    • http://8njl.com/userfiles/files/nifabozuwipemus.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/moxedanijebewepugemaruteb.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/14918658701.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/73996725118.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fapitepodojudedukemimoja.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/63962011025.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630475114.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/ruxolutivamov.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7cfbc931---57524926518.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79731569576.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7799b814---88495960765.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/pijuwawexivijezivifitiwim.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/94802640271.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/miwixarubafuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=three+to+playPDF 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_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 18836 bytes
SHA-256: bada59aaea75557b6fac39fde42014be2698ff13e98ad3631839ec8ab62aab68
font_01_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D14 10064 bytes
SHA-256: fcc1b637fdef6ece8df4243dd2ce3995b542bae01c13b954e75cde26d8bcaa10

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